Lesson 9

Workshop: Decimal Concepts

Est. Class Sessions: 2

Daily Practice and Problems

Teacher Notes
X

TIMS Task

  1. 8
  2. 5
  3. 13
  4. less
  5. more
  6. more
  7. more
  8. 0.55 is more than 1/2 so when you add 12.001 + 0.55 = 12.551 it is more than halfway between 12 and 13 and therefore closer to 13.
  9. 13.117 + 0.495 = 13.612

DD. Sums and Differences

Estimate the answers. Do not use paper and pencil.

  1. Is 4.596 + 3.093 closer to 7 or 8?
  2. Is 6.899 − 2.03 closer to 4 or 5?
  3. Is 12.001 + 0.55 closer to 12 or 13?
  4. Is 8 − 4.7 more or less than 4?
  5. Is 1.494 + 9.101 more or less than 10.5?
  6. Is 14.342 − 0.108 more or less than 14?
  7. Is 13.117 + 0.495 more or less than 13.5?
  8. Explain your reasoning for Question 3.
  9. What is the exact answer for Question 7?