Lesson 7

Workshop: Place Value Concepts

Est. Class Sessions: 2–3

Daily Practice and Problems

Teacher Notes
X
  1. 46
  2. 121
  3. 183
  4. Possible response: 86 is close to 90 and 97 is close to 100.
    90 + 100 = 190, which is close to 183.
  5. Possible response: I thought about a number line to solve
    27 + 19. 27 + 20 = 47 and 47 − 1 = 46. So 27 + 19 = 46.

W. Sample of Problems

Use a paper-and-pencil or mental math strategy to solve each problem.
Use the Addition Strategies Menu in the Student Activity Book Reference section.

  1. 27
    + 19
  2. 78
    + 43
  3. 86
    + 97
  1. Explain how you know your answer is reasonable for Question C.
  2. Choose one problem you solved with a paper-and-pencil method. Solve it again with a mental math strategy.