Lesson 2

An Addition Seminar

Est. Class Sessions: 2–3

Daily Practice and Problems

Teacher Notes
X

  1. 12 + 8 = 20

    13 + 7 = 20

    15 + 5 = 20

    16 + 4 = 20

    17 + 3 = 20


  2. Possible responses:

    5 + 7 + 8 = 20

    13 + 3 + 4 = 20

    3 + 5 + 12 = 20

F. Sums of 20

  1. What pairs of numbers have a sum of 20?




  2. Make as many number sentences as you can using three numbers that have a sum of 20.