Objective: Measure the same objects from Topic B with different non-standard units simultaneously to see the need to measure with a consistent unit.
students measure the same objects from Topic B using two different non-standard length units simultaneously, such as toothpicks and small paper clips (1.MD.2). They then use small paper clips and large paper clips, two non-standard units that happen to be the same object but at different lengths. Each time they measure one object using both units and receive inconsistent measurement results. Students then begin to ask the question, “Why do we measure with same-sized length units?” As they explore why it is so important to use the same-sized length unit, they realize that doing so yields consistent measurement results.
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