In class last night, we measured without a ruler or yardstick. We took our hands, feet, forearm, fingers, and arms to measure objects in the room. While several measurements were close (those that chose the same form of measuremen), they were not exactly the same and the measurements were not exact. This is an interesting approach when teaching the importance of proper measurements. The thought processes behind the differences of proper and improper measurement. Below is a link where a teacher has his students completing this activity.
Measuring with Non--Standard Units
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