Lesson 1

Estimation Strategies

Est. Class Sessions: 2

Daily Practice and Problems

Teacher Notes
X

Use DPP item D to practice the addition facts in Group E and the related subtraction facts. Accept either addition or subtraction number sentences. If subtraction sentences are offered first, ask for an addition sentence that also applies.

  1. 5 seashells in the morning;
    9 + 5 = 14. (14 – 9 = 5)
  2. 5 stones; 7 + 5 = 12.
    (12 – 7 = 5)

D. Seashell Solving by the Seashore

Show or tell how to solve each problem.

  1. Sam collected seashells at the beach in the morning. In the afternoon he collected 9. At the end of the day, he had a total of 14. How many seashells did he collect in the morning?

    2. Number sentence ___________________________________________________



  2. Maya collected 7 stones on Tuesday and 12 stones on Wednesday. How many more stones did she collect on Wednesday than on Tuesday?

    3. Number sentence ___________________________________________________