Lesson 5

Button Solutions

Est. Class Sessions: 2

Daily Practice and Problems

Teacher Notes
X
  1. 1 + 9 = 10

    10 + 90 = 100
  2. 10 = 4 + 6

    100 = 40 + 60
  3. 7 + 3 = 10

    70 + 30 = 100
  4. 2 + 9 = 11

    110 = 90 + 20
  5. 5 + 5 = 10

    500 + 500 = 1000
  6. 5 + 6 = 11

    500 + 600 = 1100
  7. 7 + 4 = 11

    40 + 70 = 110
  8. 8 + 3 = 11

    80 + 30 = 110

Ongoing Assessment

Use DPP item P to assess students’ strategies and fluency with the addition facts in Group C [E11, E12].

P. Addition Practice with Tens

  1. 1 + 9 =                          10 + 90 =
  2. = 4 + 6                          = 40 + 60
  3. 7 + 3 =                          70 + 30 =
  4. 2 + 9 =                          = 90 + 20
  5. 5 + 5 =                          500 + 500 =
  6. 5 + 6 =                          500 + 600 =
  7. 7 + 4 =                          40 + 70 =
  8. 8 + 3 =                          80 + 30 =