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Lesson 4.2 Multiplying Decimals

Lesson 4.2 Multiplying Decimals. Warm Up. 58 + 135 + 42 4.856 + 2.35 7.897 - 0.459 23.9 - 12.56. Purpose and Outcome. Purpose: To learn how to multiply decimals using a model. Outcome: SWBAT multiply decimal numbers like 4.6 times 0.78. Multiplying with Decimals. How would you multiply?

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Lesson 4.2 Multiplying Decimals

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  1. Lesson 4.2 Multiplying Decimals

  2. Warm Up • 58 + 135 + 42 • 4.856 + 2.35 • 7.897 - 0.459 • 23.9 - 12.56

  3. Purpose and Outcome • Purpose: To learn how to multiply decimals using a model. • Outcome: SWBAT multiply decimal numbers like 4.6 times 0.78.

  4. Multiplying with Decimals How would you multiply? 0.2 (0.5)

  5. Using a Model

  6. Using a Model

  7. Using a Model

  8. Multiplying Decimals How would you multiply? 0.7 (0.9)

  9. What do you notice? When we multiplied 0.2 (0.5) and 0.7 (0.9), did you notice anything? What about the decimal?

  10. Decimal Places 0.25 (0.36) Multiply as if you were multiplying 25 · 36 25 · 36 = and then put the decimal where it belongs

  11. Explore Cookie Monsters Arvin, Rafael, Alma, and Jasmine were eating cookies. Arvin ate 3.4 cookies and said he could not eat anymore. Rafael ate 2.1 times more cookies than Arvin. Alma ate 1.5 times more than Rafael, and Jasmine ate 3.5 times more than Arvin.

  12. Explore • Find how many cookies Rafael, Alma, and Jasmine ate. • Explain your work. • Write an ending to the story.

  13. Summary • Show me using a model and regular multiplication how to multiply 0.9 times 0.3.

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