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Let’s Talk Multiplication

Let’s Talk Multiplication. How would you solve the following?. 36 x 4 203 x 8 64 x 6. Let’s simplify. Can you decompose one of the factors to make the problem easier to solve mentally? 36 x 4 What can you do to the 4 to simplify the problem?. Let’s simplify.

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Let’s Talk Multiplication

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  1. Let’s Talk Multiplication

  2. How would you solve the following? 36 x 4 203 x 8 64 x 6

  3. Let’s simplify Can you decompose one of the factors to make the problem easier to solve mentally? 36 x 4 What can you do to the 4 to simplify the problem?

  4. Let’s simplify Can you decompose one of the factors to make the problem easier to solve mentally? 36 x 4 36 x (2 + 2) (36 x 2) + (36 x 2) 72 + 72 = 144

  5. Let’s simplify Can you decompose one of the factors to make the problem easier to solve mentally? 36 x 4 What can you do to the 36 to simplify the problem?

  6. Let’s simplify Can you decompose one of the factors to make the problem easier to solve mentally? 36 x 4 (30 + 6) x 4 (30 x 4) + (6 x 4) 120 + 24 = 144

  7. Let’s simplify Can you decompose one of the factors to make the problem easier to solve mentally? 203 x 8 What can you do to the 8 to simplify the problem?

  8. Let’s simplify Can you decompose one of the factors to make the problem easier to solve mentally? 203 x 8 203 x (4 + 4) (203 x 4) + (203 x 4) 812 + 812 =1624

  9. Let’s simplify Can you decompose one of the factors to make the problem easier to solve mentally? 203 x 8 What can you do to the 203 to simplify the problem?

  10. Let’s simplify Can you decompose one of the factors to make the problem easier to solve mentally? 203 x 8 (200 + 3) x 8 (200 x 8) + (3 x 8) 1600 + 24 1624

  11. Let’s simplify Can you decompose one of the factors to make the problem easier to solve mentally? 64 x 6 What can you do to the 6 to simplify the problem?

  12. Let’s simplify Can you decompose one of the factors to make the problem easier to solve mentally? 64 x 6 64 x ( 3 + 3) (64 x 3) + (63 x 3) 192 + 192 384

  13. Let’s simplify Can you decompose one of the factors to make the problem easier to solve mentally? 64 x 6 What can you do to the 64 to simplify the problem?

  14. Let’s simplify Can you decompose one of the factors to make the problem easier to solve mentally? 64 x 6 (60 + 4) x 6 (60 x 6) + (4 x 6) 360 + 24 384

  15. Let’s Partner Practice • Each partner will choose a different factor to decompose to simplify the problem. • Compare answers. • Explain your process to your partner. 89 x 7

  16. Let’s Partner Practice • Each partner will choose a different factor to decompose to simplify the problem. • Compare answers. • Explain your process to your partner. 112 x 8

  17. Let’s Partner Practice • Each partner will choose a different factor to decompose to simplify the problem. • Compare answers. • Explain your process to your partner. 43 x 9

  18. Let’s Partner Practice • Each partner will choose a different factor to decompose to simplify the problem. • Compare answers. • Explain your process to your partner. 602 x 12

  19. Let’s Partner Practice • Each partner will choose a different factor to decompose to simplify the problem. • Compare answers. • Explain your process to your partner. 43 x 13

  20. On Your own • Solve the following problems using the strategy we learned today. • You choose which number to decompose. 432 x 4 263 x 12 56 x 14 21 x 82 34 x 67 205 x 36 84 x 4 305 x 19 16 x 502 704 x 7 646 x 5 93 x 17

  21. So, what do you think? • Was the strategy easy to learn? • What kind of factor (larger or smaller) did you prefer to decompose? Why? • Had you used this strategy to multiply before? • Does this strategy make mental math simpler? • Do you think you would be more accurate with this method or the traditional method? Why?

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