Lesson 1

Addition Strategies

Est. Class Sessions: 2

Daily Practice and Problems

Teacher Notes
X

TIMS Bit

These problems provide an opportunity for students to review a few addition facts and relate them to adding multiples of ten.
  1. 13
  2. 130
  3. 110
  4. 50
  5. 80
  6. 100
  7. 100
  8. 140
  9. 150
  1. Possible strategy: Students may break apart 70 into 20 and 50. Then after joining 20 and 80 to make 100, the remaining 50 is added to equal 150.

A. Quick Addition

Do these problems in your head. Write only the answers.

  1. 4 + 9 =
  2. 40 + 90 =
  3. 20 + 90 =
  4. 20 + 30 =
  5. 30 + 50 =
  6. 40 + 60 =
  7. 10 + 90 =
  8. 60 + 80 =
  9. 80 + 70 =
  10. Show or tell your strategy for Problem I.