2.MD.A.2

Measure the length of an object twice, using length units of different lengths for the two measurements; describe how the two measurements relate to the size of the unit chosen.

 

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Unpacking the Standard: 2.MD.A.2
Student Friendly Learning Target: 2.MD.A.2
Visual Representation of Learning Target: 2.MD.A.2

Summary:

Length is a very basic, beginning measuring activity for elementary students. When measuring an object’s length, students will identify the attributes to be measured, pick the appropriate tools that they will use to measure, and then count the units on the tool that span the length of the object. For this standard, students will choose two appropriate units to use to measure the same objects and then state their findings. The key point is that if you measure an item with a smaller object, then you will have a greater number of lengths than if you used a larger unit to measure the same item.


Understanding the Standard:

    • Everyday objects found around the classroom are an excellent way to reinforce the connection between measurement and everyday life.
    • Students should have the opportunity to work in pairs or small groups to measure a variety of objects using two different length units. They should then record their findings and then communicate the basic ideas they encountered.
    • A variety of manipulatives and technologies should be integrated into this topic of math exploration.

      Questions to Focus Instruction:

        • Can students choose two different measurement units to measure the same object?
        • Can students accurately measure an object with two different units and explain the results?
        • Can students justify why the two measurement "counts" are different by accurate?

          Skills:


          Prior to:
          Students begin their study of measurement with non-standard units and then using a ruler to measure to the nearest inch.

          At Grade Level:
          Students will measure an object using two different units. They will generalize and compare their findings.

          Moving Beyond:
          Students will measure objects in standard and metric units. They will move into square units for development into perimeter and area.