Lesson 4

Addition Review

Est. Class Sessions: 2–3

Daily Practice and Problems

Teacher Notes
X

TIMS Bit

This DPP item can be used to practice subtraction facts from all groups using multiples of 10.

  1. 6
  2. 60
  3. 9
  4. 90
  5. 5
  6. 50
  7. 8
  8. 80
  9. 8
  10. 80
  1. Possible response: Since I know 17 − 9 = 8, I know that 170 − 90 will be 80 because it is 10 times more.
  2. Possible response: For both I and J you can use the math fact 17 − 9 to find the answer. In J you need to add 0 to the answer because the problem is 170 − 90.

Q. More Subtraction Practice

Solve the subtraction problems. Use mental math. Write only the answers.

  1. 15 − 9 =
  2. 150 − 90 =
  3. 16 − 7 =
  4. 160 − 70 =
  5. 13 − 8 =
  6. 130 − 80 =
  7. 11 − 3 =
  8. 110 − 30 =
  9. 17 − 9 =
  10. 170 − 90 =
  1. Explain how solving Question I helped you solve Question J.
  2. How are the answers to Question I and Question J alike? How are they different?