Lesson 1

Just Passing Time

Est. Class Sessions: 1

Daily Practice and Problems

Teacher Notes
X

TIMS Task

Use this DPP item to provide practice using rectangular arrays to solve multiplication facts for the nines. Provide copies of the Centimeter Grid Paper Master.

    1. 5
    2. 45


    1. 6
    2. 54


    1. 4
    2. 36


    1. 8
    2. 72


  5. Possible response: First I multiplied 10 × 9 = 90 and then I subtracted 9. 90 − 9 = 81, so 9 × 9 = 81.

B. A Strategy for 9s

Roberto used a rectangle to show Levi how he can use the multiplication facts for the 10s to learn the 9s.

Use Roberto's strategy to solve the following problems.

    1. 9 × 5 = 10 × 5 −
    2. 9 × 5 =
    1. 9 × 6 = 10 × − 6
    2. 9 × 6 =
    1. 9 × 4 = 10 × 4 −
    2. 9 × 4 =
    1. 9 × 8 = 10 × − 8
    2. 9 × 8 =
  5. Show or tell how to use Roberto's strategy to solve 9 × 9 = .