Lesson 2

Modeling Division

Est. Class Sessions: 2–3

Daily Practice and Problems

Teacher Notes
X

TIMS Task

  1. Close to 11/2
  2. Close to 21/2
  3. Close to 1
  4. Close to 3
  5. Close to 3
  6. Close to 11
  7. Possible response: I know that 30/60 = 1/2 and 7/14 = 1/2 so together they equal 1 whole. 19/20 is almost 1 whole and 7/6 is a little bigger than 1 whole, so together all of the fractions will be close to 3.

H. Under or Over

For each sum or difference decide which is the best estimate.

  1. 4/10 + 7/15 + 11/20

    Close to 1 Close to 11/2 Close to 2
  2. 2/3 + 3/4 + 6/10 + 7/12

    Close to 11/2 Close to 2 Close to 21/2
  3. 1/6 + 1/3 + 1/4 + 1/5

    Close to 1/2 Close to 1 Close to 11/2
  4. 30/60 + 7/14 + 19/20 + 7/6

    Close to 2 Close to 21/2 Close to 3
  5. 3/7 + 4/9 + 2/3 + 7/8 + 5/9

    Close to 2 Close to 21/2 Close to 3
  6. 32/3 + 61/4 + 11/2

    Close to 10 Close to 101/2 Close to 11
  7. Show or tell how you chose your estimate for Question 4.