Lesson 3

Making Predictions from Best-Fit Lines

Est. Class Sessions: 1

Daily Practice and Problems

Teacher Notes
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TIMS Task

Use this DPP item to practice the last six multiplication facts.

Provide copies of the Centimeter Grid Paper Master.

Compare Levi's strategy to the strategy students used in DPP item B to solve 6 × 7 or 7 × 6.

  1. Possible response: Break apart 6 into 3 + 3 and then multiply 3 × 8 = 24. Then you can double 24 to get the answer 48.
  2. Possible response: Break apart 7 into 5 + 2 and then multiply 5 × 8 = 40 and 2 × 8 = 16 and then add 40 + 16 = 56.
  3. Possible response: Break apart 8 into 4 + 4 and then multiply 4 × 4 = 16. Then you can double 16 to get 32.

H. Break-Apart Facts

Levi said, “To multiply 6 × 7, I break apart 7 into 5 + 2. Then I multiply 6 × 5 = 30 and 6 × 2 = 12 and add 30 + 12 = 42.”

Use Levi's method to multiply:

  1. 6 × 8
  2. 8 × 7
  3. 4 × 8