Lesson 4

Which Picks Up More?

Est. Class Sessions: 4–5

Daily Practice and Problems

Teacher Notes
X

TIMS Bit

Use this item to practice the fact families for the subtraction facts in Groups 7 and 8.

  1. 8
    1. 15 − 8 = 7
    2. 7 + 8 = 15
    3. 8 + 7 = 15
  1. 8
    1. 14 − 8 = 6
    2. 8 + 6 = 14
    3. 6 + 8 = 14
  1. 9
    1. 9 + 9 = 18
    2. It is a double. There are only two number sentences for this fact family.

M. Fact Families

Sort Subtraction Flash Cards: Groups 7 and 8 into pairs of facts that belong to the same fact family. Be ready to discuss the strategies you used to make pairs.

  1. Solve the number sentence and complete the fact family for 15 − 7 =
    1. _________________________
    2. _________________________
    3. _________________________
  2. Solve the number sentence and complete the fact family for 14 − 6 =
    1. _________________________
    2. _________________________
    3. _________________________
  3. Solve the number sentence and complete the fact family for 18 − 9 =
    1. _________________________
    2. Why is this fact family different from the others?