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Grade 5 Math · World 7: Sharing Kitchen · Level 71
Bigger, Smaller, or the Same?
Predict the size of a product before working it out.
Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.
What children learn in Level 71
- Here's a secret: you can predict the size of a product before you multiply. Think of a fraction as a dial that resizes a number.
- Multiply by a fraction less than 1, and the number shrinks. 12 times 1 half is 6, less than 12. That's why 12 children with half a sandwich each need fewer than 12 sandwiches.
- Multiply by a fraction greater than 1, and the number grows.
- Multiply by a fraction equal to 1, and it stays the same.
Georgia's K-12 Mathematics Standards:
- 5.NR.3.5 — Explain why multiplying a whole number by a fraction greater than one results in a product greater than the whole number, and why multiplying a whole number by a fraction less than one results in a product less than the whole number and multiplying a whole number by a fraction equal to one results in a product equal to the whole number.