Lesson 3

The Meaning of the Mean

Est. Class Sessions: 2–3

Daily Practice and Problems

Teacher Notes
X

TIMS Task

    1. 174
    2. 581
    3. 888
    4. 500
    5. 183
    6. 1254
  2. Possible response: 240 − 70 = 170
  3. 581
  4. Possible strategy for Question 1C: First subtract 6 from 906:
    906 − 6 = 900. Then subtract 12 more in two steps: 900 − 10 = 890 and 890 − 2 = 888.

J. Arithmetic Review

Solve these problems using paper and pencil or mental math. Estimate to see if your answers are reasonable.

    1. 46 + 106 + 31 =
    2. 1005 + 9 + 240 =
  1. Show or tell your estimation strategy for Question 1A.
  2. Which answer is closest to 700?
  3. Choose a problem and show or tell how you can solve it using mental math.