Lesson 2

Partition Shapes

Est. Class Sessions: 2–3

Daily Practice and Problems

Teacher Notes
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DPP item G reviews subtraction as a comparison rather than a "take away" situation. Student strategies may include counting up as well as other strategies. Encourage discussion of various strategies. Have number lines and connecting cubes readily available.

  1. 4 states; Possible number sentences: 12 − 8 = 4; 8 + 4 = 12
  2. 5 rabbits; Possible number sentences: 12 − 7 = 5; 7 + 5 = 12

Ongoing Assessment

Use DPP item G to assess students' fluency with the subtraction facts related to the addition facts in Group E [E10].

See the Letter Home for targeted practice ideas.

G. How Many More

Solve the problems and write a number sentence.

  1. Romesh has been to 12 states in the United States. Jason has been to 8 states. How many more states has Romesh been to than Jason?
  2. Liz saw 12 rabbits at the park. Kathy saw 7 rabbits. How many more rabbits did Liz see than Kathy?