Lesson 3

Cubes and Place Value

Est. Class Sessions: 2–3

Daily Practice and Problems

Teacher Notes
X

Use DPP item K to practice related addition facts in Group F. Have connecting cubes and ten frames readily available if students need them to support their reasoning.

  1. 14;
    10 + 6 is 16, 2 less is 14
  2. 17;
    10 + 8 is 18, 1 less is 17

K. What Is My Strategy

Mrs. Jackson gives the following problem to her class.

                  9
               + 6

Carl shows his work like this:

                10 + 6 = 16
                9 is one less than 10
                9 + 6 = 15

Show or tell how to solve the following problems using Carl's strategy.

  1.    8
    + 6
  2.    9
    + 8