Lesson 2

Rule Machines

Est. Class Sessions: 2

Daily Practice and Problems

Teacher Notes
X

Use DPP item H to review math fact families from Groups C–D and F.

  1. 9
    3 + 6 = 9
    9 − 6 = 3
    9 − 3 = 6
  2. 4
    10 = 4 + 6
    10 − 4 = 6
    10 − 6 = 4
  3. 18
    18 − 9 = 9
     
     
  4. 3
    11 − 3 = 8
    3 + 8 = 11
    8 + 3 = 11
  5. 2
    9 − 7 = 2
    2 + 7 = 9
    7 + 2 = 9
  6. 13
    6 + 7 = 13
    13 − 6 = 7
    13 − 7 = 6
  7. 15
    15 = 8 + 7
    15 − 8 = 7
    15 − 7 = 8
  8. 5
    11 − 5 = 6
    5 + 6 = 11
    6 + 5 = 11
  1. Answers will vary. Possible strategy: 12 − 6 = 6, so 11 − 6 is one less or 5.

H. Addition and Subtraction Facts 3

Solve each fact. Then write the other facts in the same fact family.

  1. 6 + 3 =

    _____________

    _____________

    _____________
  2. 10 = 6 +

    _____________

    _____________

    _____________
  3. 9 + 9 =

    _____________

    _____________

    _____________
  4. = 11 − 8

    _____________

    _____________

    _____________
  5. 7 = 9 −

    _____________

    _____________

    _____________
  6. 7 + 6 =

    _____________

    _____________

    _____________
  7. = 7 + 8

    _____________

    _____________

    _____________
  8. 11 − 6 =

    _____________

    _____________

    _____________
  1. Show or tell your strategy for Question H.