Lesson 3

Is It Reasonable

Est. Class Sessions: 1–2

Daily Practice and Problems

Teacher Notes
X

Use DPP item I to provide practice with subtraction facts for Group A.

Thinking addition may be a helpful strategy for some students. Knowing that
2 + 4 = 6 helps in finding the answer to the related fact 6 − 4 = 2.

  1. 2
  2. 1
  3. 2
  4. 4
  5. 3
  6. 0
  7. 3
  8. 2
  9. 2
  10. 1
  11. 1
  12. 1
  13. 1
  14. 2
  1. Possible solution: 2 + 3 = 5 so 2 = 5 − 3

I. Subtraction Practice: Group A

  1. 4 − 2 =
  2. 2 − = 1
  3. 6 − 4 =
  4. = 6 − 2
  5. 2 = 5 −
  6. = 2 − 2
  7. = 4 − 1
  8. 3 = 5 −
  9. 3 − 1 =
  10. 1 − = 0
  11. 4 − = 3
  12. 3 − 2 =
  13. 1 − 0 =
  14. 2 − 0 =
  1. Show or tell your thinking for Question E.