NCTM STANDARDS Week 5: Measurement Video 1 - Measurement Lesson: List at least two things students need to know before they can understand measurement Students need to know how to use tools such as a rule, attributes (by knowing what the length is), and select a unit which has an attribute.

In the video, the teacher had the students find the perimeter of their hands. What else could students measure to understand perimeter? Why do you think the teacher used a nonstandard unit of measurement, such as the students' hand? In order to understand perimeters students could try and measure their desk. The teacher used a nonstandard unit in order to tell the difference. It would help understand the theory behind the concept.

Why is estimation important when students are learning about...