Lesson 3

Architects in Cubeland

Est. Class Sessions: 1–2

Daily Practice and Problems

Teacher Notes
X

Have students share tools and strategies. Students should have the Subtraction Strategies Menu from the Student Activity Book Reference section, a 200 Chart, base-ten pieces, and a desk number line readily available.

  1. 50 + 11
    20 + 4
    30 + 7 = 37
  2. Encourage students to share their strategies for solving Jackie's problem a different way.

H. Subtraction

1. Jackie did not finish this subtraction problem. Finish it for her.

61 − 24 =


61 = 50 +         
24 =          + 4

                          


2. Solve Jackie's problem another way.