Lesson 4

Searching the Forest

Est. Class Sessions: 4

Daily Practice and Problems

Teacher Notes
X

TIMS Task

  1. 100 boxes
  2. 109 boxes
  3. more; Possible response: I rounded 78 to 80. 80 + 45 = 125
  4. About 500 boxes. Answers will vary based on students' strategies. Discuss students' strategies. Which strategies are more efficient?
    One possible strategy: add Lin and Jessie together first, 200. Jackie and Maya are about 200 together. 200 + 200 = 400. 78 is close to another 100 so the total is about 500.

R. Selling Cookies

Lin, Irma, Jackie, Maya, and Jessie sold cookies for their club. This data table shows the number of boxes each girl sold.

  1. What is the median number of boxes sold?
  2. How many more boxes did Lin sell than Jessie?
  3. Did Irma and Jessie together sell more or less than Maya? Show or tell how you decided.
  4. Estimate about how many boxes the five girls sold altogether. Use mental math or a few quick notes.