Lesson 2

Perimeter vs. Length Lab

Est. Class Sessions: 4

Daily Practice and Problems

Teacher Notes
X

TIMS Task

Ask students to share their strategies. Some students may use strategies such as counting up or counting back to find the answers to these math facts.

  1. 3
  2. 5
  3. 69
  4. 4
  5. 2
  6. 67
  1. 92 − 2 = 90. Subtract 1 more, or 3, and the answer is 89.

F. Subtraction Practice

Use mental math to solve the following problems.

  1. 92 − = 89
  2. 92 − 87 =
  3. 71 − 2 =
  4. 43 − = 39
  5. 41 − 39 =
  6. 72 − = 5
  1. Explain how you solved Question A.