Lesson 10

Break-Apart Products with Larger Numbers

Est. Class Sessions: 2–3

Daily Practice and Problems

Teacher Notes
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TIMS Task

This DPP item involves the multiplication facts for the 5s and 10s.

  1. 35; Possible response: Count by 5s—30 35 40
  2. 30; Count by 10s so you have factors of 2 and 5. 20, 30, 40
  3. 16; Possible response: I looked at our class chart and the only square number less than 20 and more than 15 is 4 × 4 = 16.
  4. Answers will vary.

FF. What Numbers Are We?

  1. I am more than 30 and less than 40. I am a multiple of 5. Who am I? Show or tell how you know.
  2. I am more than 20 and less than 40. Both 5 and 10 are factors of me. Who am I? Show or tell how you know.
  3. I am a square number. I am less than 4 × 5 but more than 3 × 5. Who am I? Show or tell how you know.
  4. Make up your own riddle. Write it down and trade with a friend. Can you solve your friend's riddle?