above, below 
The kite is above the house. The clothes are below the butterfly.

add

+ =

adjacent

Next to, beside. These lines are adjacent.

after, before,
between

The bear is before the elephant. The monkey is after the elephant. The elephant is between the bear and the monkey.

afternoon, morning, evening

morning
afternoon
evening

AM 
Is the half of the day from midnight to midday. What we call morning. ? INCLUDEPICTURE "http://www.mathsisfun.com/measure/images/ampm.gif" \* MERGEFORMATINET
Is the half of the day from midnight to midday. What we call morning.
It comes from the Latin "Ante Meridiem".

alike 
These shapes are alike in color. These shapes are not alike by the number of sides.

bar graph 

bottom, middle, totop 

calendar 

Cardinal number 
Cardinal numbers (or cardinals) are numbers that say how many of something there are, such as one, two, three, four, five.?Answers the question "How Many?"??Example: there are five coins.
Cardinal numbers (or cardinals) are numbers that say how many of something there are, such as one, two, three, four, five.
Answers the question "How Many?"
Example: there are five coins.

circle

A 2dimensional shape made by drawing a curve that is always the same distance from a center.

clock 
An instrument used to measure or indicate time.

Clockwise; counterclockwise 
Counterclockwise is moving in the direction of the hands on a clock.?The opposite direction is called counterclockwise. ?
Counterclockwise is moving in the direction of the hands on a clock.?The opposite direction is called counterclockwise. ?
Counterclockwise is moving in the direction of the hands on a clock.?The opposite direction is called counterclockwi
Counterclockwise is moving in the direction of the hands on a clock.?The opposite direction is called counterclockwise.
Taps and most screws and bolts are closed by turning clockwise.

cone 
A solid (3dimensional) object that has a circular base and one corner.

cube 
A cube is a boxshaped solid object that has six identical square faces.

cylinder 
A cylinder is a solid object with:
* two identical flat circular or elliptical ends?
* and one curved side.

cup 
A unit of measurement. One cup = 8 ounces.

difference 
Difference is the amount between two objects
9 – 3 = 6 the difference is 6

digit 
A symbol used for numbers.
The digits are 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9 are digits.
9 is a one digit number, and 19 has two digits, 219 has three digits.

dime 
10¢ or 10 cents

divide 
6 items
6 ÷ 2 = 3
2 2 2

dollar 
1 dollar = 100 pennies
$1.00

doubles 
twice as many or as much; two times as many or as much

edge 
A line that is the intersection of two planes (sides)

equal 
Equal means same as.
The stacks are equal.
25 is equal to 25.

estimate 
To guess roughly about how many or how much.
the estimate is about ten buttons

even numbers 
Even numbers can be divided exactly by 2, and can make pairs.
The last digit will be 0, 2, 4, 6, 8.

face 
Any of the individual surfaces of a solid object.
Example: this tetrahedron has 4 faces (there is one face you can't see)

factor 
Factors are the numbers you multiply together to get another number:
Example: 2 and 3 are factors of 6, because 2 x 3 = 6.

foot 
1 foot = 12 HYPERLINK "Javascript:%20new_definition(link)" inches.

fraction 
A fraction is a part of a whole.
The number written on the bottom (the denominator) tells you how many parts the whole is divided into, and the top number (the numerator) tells how many you have.

formula 
Numbers and symbols that show how to work something out.
Example: The formula for finding the volume of a box is "V = w × d × h"?(V stands for volume, w for width, d for depth and h for height. ?If w=4, d=5 and h=10, then V = 4×5×10 = 200.)

finite 
Has an end. Could be measured, or given a value.
There are a finite number of people at this beach.
There are also a finite number of grains of sand at this beach.
The length of the beach is also finite.

frequency 
How often something happens during a period of time.
Example: This is a heartbeat with a frequency of 78 beats per minute.

gram 
A measure of weight.
A paper clip weighs about 1 gram

greater than 
more than >
63 is greater than 29.
63 > 29

gradient 
How steep a straight line is.?
In this example the gradient is 3/5 = 0.6

graph 
A diagram of values, usually shown as lines or bars.

gross 
Before any deductions.
Example: "gross income" means before tax and expenses.?
Also means twelve dozen (144)

half 
One of two equal parts of a whole
Example: my friend and I shared a piece of fruit. We each had half.

half dollar 
1 half dollar = 50 pennies
50¢ 50 cents

half hourhalf hour 
There are 30 minutes in a half hour; between 4:00 and 4:30 is a half hour.

height 
The vertical distance from top to bottom

hexagon 
A 6sided polygon (a flat shape with straight sides).

horizontal 
Going sidetoside, like the horizon.
Parallel to the horizon.
(Updown is called vertical)

hour 
A period of time equal to 1/24 (a twentyfourth) of a day.
1 Day = 24 Hours?
1 Hour = 60 minutes.
Example: The amount of time between 9:00 and 5:00 is eight hours.

hundred 

hundreth 
One part in a hundred equal parts

hypotenuse 
The side opposite the right angle in a rightangled triangle

Improper fraction 
An improper fraction is a fraction where the numerator (the top number) is greater than or equal to the denominator (the bottom number). In other words, it is topheavy.
Example: 5/3 (five thirds) and 9/8 (nine eighths) are improper fractions?Improper fractions are NOT bad.

inch 
An inch is a measure of length. There are 12 inches in a foot, and 36 inches in a yard.
The abbreviation is in., or sometimes the double quote mark:
One inch is exactly 2.54 centimeters.
Example: this ruler measures up to 12 inches (or up to 30 centimeters on the bottom scale).

increase 
Make something bigger (in size or quantity).

inequality 
An inequality says that two values are not equal.
a ≠ b says that a is not equal to b
There are other special symbols that show in what way things are not equal
equal
=
not equal
≠
less than
?
grea
er than
?
less than or equal to
≤
greater than or equal to
≥
a < b says that a is less than b?
a > b says that a is greater than b
a ≤ b means that a is less than or equal to b
a ≥ b means that a is greater than or equal to b.

integer 
number with no fractional part.
Includes the counting numbers {1,2,3,…}, zero {0}, and the negative of the counting numbers {1, 2, 3, …}
You can write them down like this: {…, 3, 2, 1, 0, 1, 2, 3, …}

intersect

To cross over (have some common point)
The red and blue lines intersect.

kilometer 
A Metric measure of distance. Equal to 1,000 meters.
The abbreviation is km.
Example: it takes about 10 minutes to walk 1 km
1 kilometer = 0.6 miles approximately.?
Example: 60 miles is about 100 kilometers

less than 
< shows that one number is smaller than another
29 < 63
29 is less than 63

Length 
Distance. How far from end to end.
Example: the length of this guitar is about 1 meter

line 
A long thin mark made by a pen, pencil, etc.
In geometry a line:
* is straight (no curves),
* has no thickness, and ?
* extends in both directions without end (infinitely).
If it does have ends it would be called a "Line Segment".

line graph 
A graph that uses points connected by lines to show how something changes in value (as time goes by, or as something else happens).

lowest common denominator 
The smallest number that can be used for all denominators (the bottom number) of 2 or more fractions
Example: the Lowest Common Denominator of 1/2 and 2/3 is 6, because they can be written as 3/6 and 4/6. Also called least common denominator.

liter 
1 liter is a little more than 1 quart

maximum 
The largest value.
The maximum of {14, 4, 16, 12} is 16

meter 
1 meter is a measurement than equals one hundred centimeters

mean 
The mean is the average of the numbers.
It is easy to calculate: Just add up all the numbers, then divide by how many numbers there are. Example: what is the mean of 2, 7 and 9?
Add the numbers: 2 + 7 + 9 = 18
Divide by how many numbers (i.e. we added 3 numbers): 18 ÷ 3 = 6?
So the Mean is 6

measure 
To find a number that shows the size or amount of something usually, the number is in reference to some standard measurement, such as a meter or kilogram.

median 
The middle number (in a sorted list of numbers). Half the numbers in the list are less, and half the numbers are greater. To find the Median, place the numbers you are given in value order and find the middle number.
Example: find the Median of {12, 3 and 5}. Put them in order: {3, 5, 12}, the middle number is 5, so the median is 5.
If there are two middle numbers (as happens when there are an even amount of numbers) then average those two numbers.
Example: find the Median of {12, 3, 5 and 2}. Put them in order: {2, 3, 5, 12}, the middle numbers are 3 and 5, the average of 3 and 5 is 4, so the median is 4.

midpoint 
The middle of, the point halfway along.

milli 
A prefix meaning onethousandth (1/1,000)

millimeter 
A Metric unit of length, used for small lengths.
The abbreviation is mm. There are 1,000 mm in one meter.
The small lines on this ruler show mm. The ruler can measure up to 300 mm (the "30" means 30 centimeters which equals 300 millimeters)

million 
A million is a thousand thousands (1,000,000).

minimum 
The smallest value.
The minimum of {14, 4, 16, 12} is 4.

minuend 
The number that is to be subtracted from.
minuend  subtrahend = difference
Example: in 8  3 = 5, 8 is the minuend.

minute 
A unit of time equal to 60 seconds.
There are 60 minutes in an hour.

mode 
The number which appears most often in a set of numbers.
Example: in {6, 3, 9, 6, 6, 5, 9, 3} the Mode is 6 (it occurs most often).

month 
One of the twelve parts of the year:
January, February, March, April, May, June, July, August, September, October. November, December

multiple 
The result of multiplying by a whole number
Example: 4 × 5 = 20?
20 is a multiple of 4 and also of 5.
These are some of the multiples of 3: 12, 15, 18, 21

multiplication 
The basic idea of multiplication is repeated addition.
For example: 5 × 3 = 5 + 5 + 5 = 15
But as well as multiplying by whole numbers, you can also multiply by fractions or decimals.
For example 5 × 3½ = 5 + 5 + 5 + (half of 5) = 17.5

multiplication sentence 
The story of what is multiplied and what the product is.
4 x 3 = 12

multiplication tables 
table that shows you the results of multiplying two numbers. One number is along a row, the other down a column, and the results are shown where a row and column meet.
Example: 6 multiplied by 7 is 42

natural number 
The whole numbers from 1 upwards: 1, 2, 3, and so on ...
Or from 0 upwards in some fields of mathematics: 0, 1, 2, 3 and so on ...
No negative numbers and no fractions.

negative number 
Less than zero.
(Positive means more than zero. Zero is neither negative nor positive.)
A negative number is written with a minus sign in front
Example: 5 is negative five

nickel 
nickel
5¢ or 5 cents
1 nickel = 5 pennies

not equal to 
There is a special symbol used to show that one number is not equal to another. It is ≠
a ≠ b says that a is not equal to b
Example: 4 ≠ 9 shows that 4 is not equal 9

number line 
number line

number pattern 
A list of numbers that follow a certain sequence or pattern.
Example One: 1, 4, 7, 10, 13, 16, 19, … starts at 1 and jumps 3 every time.
Example Twp: 2, 4, 8, 16, 32, … doubles each time

numeral 
A symbol or name that stands for a number.
Examples: 3, 49 and twelve are all numerals

numerator 
The top number in a fraction.
Shows how many parts we have.

oblong 
A rectangle that is not a square. (all sides not equal)

octogon 
An 8sided polygon (a flat shape with straight sides).

odd number 
Any integer that cannot be divided exactly by 2.
The last digit will be 1, 3, 5, 7 or 9
Example: 3, 1, 7 and 35 are all odd numbers

order of operations 
The rules of which calculation comes first in an expression
Do everything inside parentheses first: ()
then do exponents: x2
then do “multiplies” and “divides” from left to right
lastly do the “adds” and “subtracts” from left to right
Example: 5 × (3 + 4)  2 × 8 = 5 × 7  2 × 8 = 35  16 = 19

ordering 
Putting things into their correct place following some rule.
Example: put the numbers {3, 12, 5, 2, 9} into order from highest to lowest. Start at the highest (12) and go down: {12, 9, 5, 3, 2}
Putting the shapes in order by number of sides.

ordinal number 
A number that tells the position of something in a list.
1st, 2nd, 3rd, 4th, 5th etc.

ounce 
A unit of weight. There are 16 ounces in a pound.
A slice of bread weighs about one ounce.

oval 
An oval or ovoid is any curve that looks like an egg or an ellipse.
It is not a precise term and there are many curves that get called "oval".

pair 
Two together. Often with something in common.
Example: {12,7} is a pair of numbers

parallel 
Always the same distance apart and never touching.

parallelogram 
Opposite sides are parallel and equal in length, and opposite angles are equal (angles "a" are the same, and angles "b" are the same)
NOTE: Squares, Rectangles and Rhombuses are all Parallelograms!

parentheses 
Parentheses or "round brackets" are the familiar ( ) symbols used in pairs to group things together.
Example: (3 + 2) x (6  4) = 5 x 2 = 10
The Parentheses group 3 and 2 together, and 6 and 4 together.

pattern 
Things that are arranged following a rule or rules.
Example, red, blue green, red blue, green…
Example: there is a pattern in these numbers: 2, 7, 12, 17, 22, … The rule is "start at 2 and add 5 each time"

pentagon 
A 5sided polygon (a flat shape with straight sides).

percent 
Percent means parts per 100. The symbol is %
Example: 25% means 25 per 100
(25% of this box is grey)

perimeter 
The distance around a twodimensional shape.
Example: the perimeter of this rectangle is 3+7+3+7 = 20
The perimeter of a circle is called the circumference.

perpendicular 
At right angles (90°) to

pi 
The ratio of a circle's circumference to its diameter.
Approximately equal to 3.14159265358979323846…

pie chart 
A pie chart is a circular chart divided into sectors; each sector shows the relative size of each value.

place value 
The value of where the digit is in the number, such as units, tens, hundreds, etc.
In 352, the place value of the 5 is "tens"

plane 
A plane is a flat surface with no thickness.
It extends forever.

plot 
To draw on a graph or map.
Here we have plotted the point (12,5).

plus 
Another word for add. The symbol is +
Example: 30 cents plus 20 cents equals 50 cents.

PM 
Is the half of the day from Midday to Midnight.
What we call afternoon and evening.
It comes from the Latin "Post Meridiem" for "after midday".

point 
An exact location. It has no size, only position.
Here we have marked the location of three points: (2,1), (0,0) and (3,2)

polygon 
A plane shape (twodimensional) with straight sides.
Examples: triangles, rectangles and pentagons.
(Note: a circle is not a polygon because it has a curved side)

polyhedron 
A solid with flat faces (from Greek poly meaning "many" and edron meaning "face").
Example: pyramids and prisms
Each flat surface (or "face") is a polygon.

population 
The whole group from which a sample is taken.

position 
Where something is located (often in relation to something else).
Example: here are some statements about position in this photo:
* the dog is in front of the woman, ?
* the boats are on the water?
* the mountains are in the distance

positive 
Greater than zero.
(Negative means less than zero. Zero is neither negative nor positive.)
Example: 5 is a positive number, or positive five.

power 
The power of a number shows you how many times to use the number in a multiplication. It is written as a small number to the right and above the base number. Another name for power is index or exponent.?
In this example: 102 = 10 × 10 = 100

prime factor 
A factor that is a prime number. One of the prime numbers that, when multiplied, give the original number.
The prime factors of 15 are 3 and 5 (3x5=15), and 3 and 5 are prime numbers).

prime number 
A Prime Number can be divided evenly only by 1, or itself. (In other words, it's factors are only 1 or itself)
Example: 13 can only be divided evenly by 1 or 13, so it is a prime number.
If it is not a Prime Number it is called a Composite Number.
Example: 14 can be divided evenly by 1, 2, 7 and 14 so it is a composite number.

probability 
Probability is the chance that something will happen  how likely it is that some event will happen.
Sometimes you can measure a probability with a number: "10% chance of rain", or you can use words such as impossible, unlikely, possible, even chance, likely and certain. ?
Example: "It is unlikely to rain tomorrow".

problem 
A question that needs a solution.
In mathematics some problems use words:
"John was traveling at 20 km per hour for half an hour. How far did he travel?"
And some use equations: "Solve x+5=22".

Product 
The answer when two or more numbers are multiplied together.

property 
An attribute or character that something has. Such as color, height, weight, etc.
Some properties of this shape are:
Its color is gray, it has 5 sides, it is regular (all sides and angles are equal)

Protractor 
An instrument used in measuring or drawing angles.

Pyramid 
A solid object where:
* The base is a polygon (a straightsided shape)
* The sides are triangles which meet at the top (the apex).
It is a polyhedron.
This is a square pyramid, but there are also triangular pyramids, pentagonal pyramids, and so on.

Quantity 
How much there is of something.
Example: What is the quantity of rice?
You could say "a handful", or you could even count them "1262" !

Quarter 
One of four equal parts
Written as 1/4
This circle has been cut into quarters, and one quarter is darker.
Also a coin – 25¢ 4 quarters = $1.00

Quotient 
The answer after you divide one number by another
dividend ÷ divisor = quotient?
Example: in 12 ÷ 3 = 4, 4 is the quotient

Radius 
The distance from the center to the edge of a circle
It is half of the circle's diameter.

Random 
Without order. Not able to be predicted. Happening by chance.?
However, there will be an overall structure, tending to be within a certain range.?
These two dice will give random results, but always between 2 and 12.
Another Example: the values {2.18, 2.17, 2.23, 1.82, 1.87, 2.02, 1.83} are random, but are close to 2.

Random Sample 
A selection that is chosen randomly (purely by chance, with no predictability)
Example: if you wanted to take a random sample of water from a river, you could have a map of the river and choose a spot blindfolded then work out how to get there!

Range 
The difference between the lowest and highest values.
In {4, 6, 9, 3, 7} the lowest value is 3, and the highest is 9, so the range is 93 = 6.

Ratio 
A ratio shows the relative sizes of two or more values.
Ratios can be shown in different ways. Using the ":" to separate example values, or as a single number by dividing one value by the total.
Example: if there is 1 boy and 3 girls you could write the ratio as:
1:3 (for every one boy there are 3 girls)
1/4 are boys and 3/4 are girls
0.25 are boys (by dividing 1 by 4)
25% are boys (0.25 as a percentage)

Rational number 
Any number that can be made by dividing one integer by another. The word comes from "ratio".
Examples:
1/2 is a rational number (1 divided by 2, or the ratio of 1 to 2)
0.75 is a rational number (3/4)
1 is a rational number (1/1)
2 is a rational number (2/1)
2.12 is a rational number (212/100)
6.6 is a rational number (66/10)

Ray 
A ray is a line with a start point but no end point (it goes to infinity)

Real number 
The type of number we normally use, such as 1, 15.82, 0.1, 3/4, etc…
Positive or negative, large or small, whole numbers or decimal numbers are all Real Numbers.

Reciprocal 
To get the reciprocal of a number, just divide 1 by the number
Example: the reciprocal of 2 is 1/2 (half)
Every number has a reciprocal except 0 (1/0 is undefined)
It is shown as 1/x, or x1
If you multiply a number by its reciprocal you get 1

Rectangle 
A rectangle is a foursided polygon (a flat shape with straight sides) where every angle is a right angle (90°).
Also, opposite sides are parallel and of equal length.?
Example: A square is a special type of rectangle.

Reduce 
To make smaller
Example: if you reduce the heat it will get cooler

Remainder 
The amount left over after division (as happens if one number can't be divided exactly by the other)
Example: 19 cannot be divided exactly by 5. The closest you can get without going over is 3 x 5 = 15, which is 4 less than 19.
So the answer of 19 ÷ 5 is 3 with a remainder of 4.

Rhombus 
A foursided shape where all sides have equal length.
Also opposite sides are parallel and opposite angles are equal.?It is a type of parallelogram.

Right Angle 
A right angle is an angle which is equal to 90°, one quarter of a full revolution.

Roman numerals 
How ancient Romans used to write numbers.
I, V, X, L, C, D, M are the symbols used.
Example: 1984 = MCMLXXXIV
We still use them today in special places, like numbering important events such as the Olympic Games, and sometimes on clocks and books.

Root 
Where a function equals zero.
In this example, 2 and 2 are the roots of the function x2  4?But sometimes "root" is used as a quick way of saying "square root"

Rotation 
A circular movement.
There is a central point that stays fixed and everything else moves around that point in a circle. A circular movement.

Rounding 
Rounding means reducing the digits in a number while trying to keep it's value similar.
The result is less accurate, but easier to use.
This is the common method:
* Decide which is the last digit to keep
* Increase it by 1 if the next digit is 5 or more (this is called rounding up)
* Leave it the same if the next digit is less than 5 (this is called rounding down)
Example: 243 rounded to the nearest ten is 240 (because 3 is less than 5)

Row 
Things lying sidebyside. Objects, People, Numbers, etc in a horizontal line.
Example: a row of numbers: 5, 7, 11, 20, 22
(Columns go updown. Rows go leftright.)
Here is a row of apples:

Ruler 
A ruler is something used to measure distances or to rule straight lines.
This ruler is marked in cm along the top and inches along the bottom.

Sample 
A selection taken from a larger group (the "population") so that you can examine it to find out something about the larger group.

Scale 
The ratio of the length in a drawing (or model) to the length of the real thing
Example: In the drawing of the horse, "1 inch" would be "10 inches" in the real world.

Second 
The basic unit of time.
There are 60 seconds in 1 minute and 3,600 seconds in an hour.
The “Second hand” is the longer hand that moves the fastest; it shows the seconds.
One second is approximately the time of one heartbeat when you are resting. You can get a rough count of seconds by saying "One catanddog, Two catanddog, Three catanddog, … " etc., or you may prefer "athousandand One, athousandand Two, athousandand Three , … "

Segment 
The area of a circle made by a line and an arc.

Semicircle 
Half a circle

Sequence 
A list of numbers or objects which are in a special order.
Example: 2, 4, 8, 16, 32, 64, 128, 256, … is a geometric sequence (each number is 2 times the number before it)

Set 
A collection of "things" (objects or numbers, etc).
Each member is called an element of the set.
There should only be one of each member (all members are unique).
Example: {1,2,3,4} is the set of counting numbers less than 5

Shape 
The form of an object  how it is laid out in space? Common shapes are:
Circles, squares, triangles, … (two dimensional)?
Spheres, cubes, pyramids, … (three dimensional)

Sign 
Used with a name, it means a symbol used instead of words, such as the percent sign.
Used on its own, it means negative or positive.
Example: what sign is the number? Is it negative?

Similar 
In Geometry, two shapes are Similar if the only difference is size (and possibly the need to turn or flip one around).
These two shapes are Similar (one is smaller and flipped over, but otherwise same)

Sine 
In a right angled triangle, the sine of an angle is:
The abbreviation is sin

Skip counting 
Where you count forwards or backwards by a number other than 1?Example: Skip counting by 3 is: 3, 6, 9, 12, …
Where you count forwards or backwards by a number other than 1
Example: Skip counting by 3 is: 3, 6, 9, 12, …
Where you count forwards or backwards by a number other than 1?Example: Skip counting by 3 is: 3, 6, 9, 12, …

Slope 
How steep a straight line is.
In this example the slope is 3/5 = 0.6

Solid 
A three dimensional object: width, depth and height
Examples include, spheres, cubes, pyramids and cylinders.

Sort 
To arrange or group in a special way (such as by size, type or alphabetically).

Sphere 
A 3dimensional object shaped like a ball.
Every point on the surface is the same distance from the center.

Square 
A 4sided polygon (a flat shape with straight sides) where all sides have equal length and every angle is a right angle (90°)

Square numbers 
To multiply a number by itself.
Example: 4 × 4 = 16

Square Root 
The square root of a number is that special value that, when multiplied by itself, gives the number.
Example: 4 × 4 = 16, so the square root of 16 is 4.
The symbol is √?
Example: √36 = 6 (because 6 x 6 = 36)

Substitution 
In Algebra "Substitution" means putting numbers where the letters are:
Example 1: If x=5, then what is x + 10/x ?
Put "5" where "x" is: 5 + 10/5 = 7

Subtract 
To take one number away from another.?If you have 5 apples and you subtract 2, you will be left with 3.? INCLUDEPICTURE "http://www.mathsisfun.com/numbers/images/subtraction.gif" \* MERGEFORMATINET ?The symbol of subtraction is ?Example: 5  2 = 3
To take one number away from another.
To take one number away from another.?If you have 5 apples and you subtract 2, you will be left with 3.? INCLUDEPICTURE "http://www.mathsisfun.com/numbers/images/subtraction.gif" \* MERGEFORMATINET ?The symbol of subtraction is ?Example: 5  2 = 3
If you have 5 apples and you subtract 2, you will be left with 3.
The symbol of subtraction is ?
Example: 5  2 = 3

Successive 
One after the other.?
Monday, Tuesday and Wednesday are successive days.?
5 and 7 are successive odd numbers.

Sum 
The result of adding two or more numbers.
Example: 9 is the sum of 2, 4 and 3, because 2 + 4 + 3 = 9.

Supplementary Angles 
Two Angles are Supplementary if they add up to 180 degrees.?
They don't have to be together to be supplementary, just so long as the total is 180 degrees.
Examples:?
60° and 120° are supplementary angles.?
93° and 87° are supplementary angles.

Surface Area 
The total area of the surface of a threedimensional object
Example: the surface area of a cube is 6 × (Edge Length)2

Symbol 
A pattern or image used instead of words.?
Example: "+" is the symbol for "plus"?
This is the "recycle" symbol.

Symmetry 
Symmetry is when one shape becomes exactly like another if you flip, slide or turn it.
The simplest type of Symmetry is "Reflection" (or "Mirror") Symmetry, as shown in this picture of a dog.

Table 
Numbers or quantities arranged in rows and columns
This is a table of what sport people play at a school.

Tangent 
A line that just touches a curve at one point, without cutting across it.
Example: the tangent of a circle.

Temperature 
How hot or cold a thing is.
Temperature is measured using a thermometer, usually in Celsius or Fahrenheit scale.
This thermometer shows that the temperature is about 28 degrees Celsius.

Tenth 
One part in ten equal parts.?
A tenth of these 100 blocks is highlighted.
Example: one tenth of 50 is 5

Term 
In Algebra a term is either a single number or a variable, or numbers and variables multiplied together.

Threedimensional 
An object that has height, width and depth, like any object in the real world.
Example: your body is threedimensional

Times 
Another word for multiply, the symbol is x
Example: 3 times 5 is 15, or 3 x 5 = 15

Times Tables 
Another word for multiplication tables.

Timetable 
A table of information showing when things will happen.
Examples: this is part of a bus timetable.

Total 
The result of adding some numbers?
Example: In 12 + 4 + 6 = 22, 22 is the total.

Trapezoid 
A trapezoid (UK: trapezium) is a quadrilateral with one pair of opposite sides parallel.
It is not a parallelogram because only one pair of sides is parallel.
It is called a regular trapezoid if the sides that aren't parallel are equal in length and both angles coming from a parallel side are equal (shown on the right).

Triangle 
A 3sided polygon (a flat shape with straight sides).

Triple 
To make something three times as large (multiply by three)
Triple 6 is 18 (because 3 × 6 = 18)

Twice 
Two times as many.
8 is twice 4

Twodimensional 
A shape that only has two dimensions (such as width and height) and no thickness.
Squares, Circles, Triangles, etc are two dimensional objects

Unequal 
Not equal
The symbol is ≠
Example: 7 ≠ 5 (7 is not equal to 5)

Units 
How many ones. How many single items.
Used to show the "ones" place value (units, tens, hundreds, etc)
Example: 27 has two tens and 7 units.

Unit of Measurement 
A quantity used as a standard of measurement.
Example: Units of time are second, minute, hour, day, week, month, year and decade.

Value 
Money how much something is worth.
Mathematics the result or 'output' of a calculation.?
Example: 3 × 4 gives the value of 12.

Variable 
A symbol for a number we don't know yet. It is usually a letter like x or y.
Example: in x + 2 = 6, x is the variable?If it is not a variable it is called a Constant.

Vertex/Vertices 
A point where two or more straight lines meet. Corner.
Example: a corner of a polygon (2D) or of a polyhedron (3D) as shown.?The plural of vertex is "vertices".

Vertical 
In an updown position. Upright.
Example: trees grow in a vertical direction.?
(Sidetoside is called horizontal)

Volume 
The amount of 3dimensional space an object occupies. Capacity.
For this example the volume is 4×5×10 = 200 units3

Week 
A time period of 7 days.?Example: Wednesday, Thursday, Friday, Saturday, Sunday, Monday and Tuesday together make a week.
A time period of 7 days.
Example: Wednesday, Thursday, Friday, Saturday, Sunday, Monday and Tuesday together make a week.
Weekdays are Monday through Friday, and weekends are Saturday and Sunday.

Weight 
"Heaviness". The downward force caused by gravity on an object.

Whole 
All of something. Complete.

Whole number 
The numbers {0, 1, 2, 3, …} etc.?
There is no fractional or decimal part. And no negatives.?
Example: 5, 49 and 980 are all whole numbers.

Width 
The distance from side to side.
Example: the width of this door is 80 cm.

X 
The letter "x" is often used in algebra to mean a value that is not yet known. It is called an "unknown" or a "variable".
But it doesn't have to be "x", it could be "y", "w" or any letter or symbol.

X Axis 
The line on a graph that runs horizontally (leftright) through zero.
It is used as a reference line so you can measure from it.

X Coordinate 
The horizontal value in a pair of coordinates. How far along the point is.
Always written first in an ordered pair of coordinates (x,y), such as (12,5).
In this example, the value "12" is the X Coordinate.

Y Axis 
The line on a graph that runs vertically (updown) through zero.
It is used as a reference line so you can measure from it.

Y Coordinate 
The vertical value in a pair of coordinates. How far up or down the point is.
Always written second in an ordered pair of coordinates (x,y) such as (12,5).
Also called "Ordinate"

Y Intercept 
Where a straight line crosses the Y axis of a graph.

Year 
A period of time in which the Earth makes a complete revolution around the sun.
There are 365 days in a normal year and 366 days in a leap year.?The first day of the year is 1st January, and the last day is 31st December.

Zero 
The whole number between 1 and 1, with the symbol 0
Shows that there is no amount.
Example: 6  6 = 0 (the difference between six and six is zero)?Useful as a "placeholder" so that you can write a numeral properly.?Example: 502 (five hundred and two) could be mistaken for 52 (fifty two) without the zero in the tens place.
