Students will complete the yardstick challenge in which they make their own yardsticks and use them to measure the volume of the classroom. Through the challenge and 2 follow-up lessons, the mathematical purpose is greater understanding of linear, area, and volume measurement, understanding the concept of volume, and solving unit conversion problems within the same measurement system (5.MD.A.1, 5.MD.5(b)). They will engage in mathematical practices 5 (appropriate tools) and 6 (attending to precision).

Building a maker mindset (link)

Other mathematical purposes: decomposition of numbers, Write and interpret numerical expressions (5.OA.A.1 and 5.OA.A.2): 11/2 = 5.5, 8.5-5.5 = 3, 3*2 = 6.

### Prior Experience:

Measuring, addition, subtraction of fractions within ½ or ¼. Some experience with volume of a solid as the number of unit cubes that fit into the solid without gaps and overlaps.

### Assessment:

Teacher observations

Check for understanding