Lesson 1

Working with Groups

Est. Class Sessions: 2

Daily Practice and Problems

Teacher Notes
X

DPP item C provides practice with related subtraction facts for the facts in Group D.

  1. 4; 7 − 4 = 3
  2. 3; No other subtraction fact
  3. 5; 9 − 5 = 4
  4. 4; No other subtraction fact
  5. 8; 15 − 8 = 7
  6. 7; No other subtraction fact
  7. Because they are doubles. The turn-around fact is the same, for example 6 − 3 = 3.

C. Subtraction Practice Using Doubles

Solve each fact. Write the other subtraction fact that is in the same fact family. If there is not another subtraction fact for the fact family, say so.

  1. 7 − 3 = _______               ____________________
  2. 6 − 3 = _______               ____________________
  3. 9 − 4 = _______               ____________________
  4. 8 − 4 = _______               ____________________
  5. 15 − 7 = _______             ____________________
  6. 14 − 7 = _______             ____________________
  7. Why do some fact families have only one subtraction fact?