Lesson 9

Classify Numbers

Est. Class Sessions: 1–2

Daily Practice and Problems

Teacher Notes
X

TIMS Task

  1. 7
  2. less than 3
  3. more than 42
  4. 11
  5. less than 16
  6. Possible response: I thought 37 = 25 + 12, but you are subtracting .75 more. It will be almost 11, so the answer is closer to 11.

Z. Sums and Differences

Estimate to answer the following. Do not use paper and pencil.

  1. Is 4.406 + 2.9 closer to 6 or 7?
  2. Is 5.3 − 2.5 more or less than 3?
  3. Is 23.064 + 19.604 more or less than 42?
  4. Is 37.005 − 25.75 closer to 11 or 12?
  5. Is 14.9 + 1.033 more or less than 16?
  6. Explain how you decided your answer for Question 4.