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Grade 3 Math · World 7: Clock and Scale Canyon · Level 65
Weight
Compare ounces, pounds, and tons, and estimate.
Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.
What children learn in Level 65
- We weigh light things in ounces. A strawberry weighs about 1 ounce.
- Heavier things are weighed in pounds, like a 10-pound watermelon. Really heavy things are weighed in tons: a car weighs about 2 tons!
- To read a scale, see what the numbers count by. Here they count by 2s, and the needle is one small mark past 12: 13 pounds.
- Solve with one unit: a 40-pound dog and a 9-pound cat. The dog is 31 pounds heavier.
Georgia's K-12 Mathematics Standards:
- 3.MDR.5.5 — Estimate and measure liquid volumes, lengths and masses of objects using customary units. Solve problems involving mass, length, and volume given in the same unit, and reason about the relative sizes of measurement units within the customary system.