Lesson 4

Patterns in Addition and Subtraction

Est. Class Sessions: 2–3

Daily Practice and Problems

Teacher Notes
X

The addition and related subtraction facts in these fact families are from Group C.

  1. 8 + 3 = 11
    3 + 8 = 11
    11 − 8 = 3
    11 − 3 = 8
  2. 4 + 6 = 10
    6 + 4 = 10
    10 − 4 = 6
    10 − 6 = 4
  3. 9 + 1 = 10
    1 + 9 = 10
    10 − 1 = 9
    10 − 9 = 1
  4. 9 + 2 = 11
    2 + 9 = 11
    11 − 2 = 9
    11 − 9 = 2

Ongoing Assessment

Use DPP item M to assess students' abilities to determine the unknown number in an addition or subtraction sentence relating three whole numbers for the facts in Group C [E10].

M. Fact Families

Solve each problem. Then write the other facts in that fact family.

  1. 8 + 3 = ____________
    __________________
    __________________
    __________________
  2. 4 + 6 = ____________
    __________________
    __________________
    __________________
  3. 9 + 1 = ____________
    __________________
    __________________
    __________________
  4. 9 + 2 = ____________
    __________________
    __________________
    __________________