Lesson 2

Rule Machines

Est. Class Sessions: 2

Daily Practice and Problems

Teacher Notes
X

DPP item F provides the opportunity to review math fact families from Groups C and E–F.

  1. 10
    8 + 2 = 10
    10 − 8 = 2
    10 − 2 = 8
  2. 7
    7 + 10 = 17
    17 − 7 = 10
    17 − 10 = 7
  3. 5
    12 − 5 = 7
    5 + 7 = 12
    7 + 5 = 12
  4. 10
    10 − 5 = 5
     
     
  5. 4
    11 − 4 = 7
    4 + 7 = 11
    7 + 4 = 11
  6. 10
    3 + 7 = 10
    10 − 3 = 7
    10 − 7 = 3
  7. 12
    12 = 8 + 4
    12 − 8 = 4
    12 − 4 = 8
  8. 13
    5 + 8 = 13
    13 − 5 = 8
    13 − 8 = 5
  1. Answers will vary. Possible strategy: 8 + 2 = 10; 2 more is 12.

F. Addition and Subtraction Facts 2

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

  1. 2 + 8 =

    _____________

    _____________

    _____________
  2. 17 = 10 +

    _____________

    _____________

    _____________
  3. 12 − 7 =

    _____________

    _____________

    _____________
  4. = 5 + 5

    _____________

    _____________

    _____________
  5. 11 − 7 =

    _____________

    _____________

    _____________
  6. 7 + 3 =

    _____________

    _____________

    _____________
  7. = 4 + 8

    _____________

    _____________

    _____________
  8. 8 + 5 =

    _____________

    _____________

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