Lesson 4

Which Picks Up More?

Est. Class Sessions: 4–5

Daily Practice and Problems

Teacher Notes
X

TIMS Bit

This set of subtraction facts problems is taken from subtraction facts in Group 7. Students can use a variety of strategies to learn them. In a class discussion, compare strategies; is one more efficient than another?

  1. 7
  2. 6
  3. 8
  4. 7
  5. 7
  6. 5
  7. 5
  8. 6
  9. 6
  1. Answers will vary.

Ongoing Assessment

Use DPP item O to assess students' ability to use strategies to subtract including using doubles and thinking addition for facts in Groups 7. [E9]

See the Letter Home for targeted practice.

O. Subtraction Strategies

Do these problems in your head. Write only the answers.

  1. 14 − 7 = __________
  2. 12 − 6 = __________
  3. 14 − 6 = __________
  4. 13 − 6 = __________
  5. 12 − 5 = __________
  6. 10 − 5 = __________
  7. 12 − 7 = __________
  8. 14 − 8 = __________
  9. 13 − 7 = __________
  1. Explain your strategy for Question F.