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Rewrite the sentences

Review. Rewrite the sentences. 5×7=35. Multiplication. 7+7+7+7+7=35. Multiplication. 2×9=18. 9+9=18. Addition. 6+6+6=18. 3×6=18 4×4=16. Addition. 4+4+4+4=16. In focus. The vertical direction: 3 columns, 4 in each column. 3×4 = 4+4+4 = 12. The horizontal direction:

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Rewrite the sentences

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  1. Review Rewrite the sentences 5×7=35 Multiplication 7+7+7+7+7=35 Multiplication 2×9=18 9+9=18 Addition 6+6+6=18 3×6=18 4×4=16 Addition 4+4+4+4=16

  2. In focus The vertical direction: 3 columns, 4 in each column. 3×4 = 4+4+4 = 12 The horizontal direction: 4 rows, 3 in each row. 4×3 = 3+3+3+3 = 12

  3. Let’s learn 3 columns 4 rows 3×4 =12 4×3 =12 3 in each row 4 in each column 3×4 = 4×3 Exchange the position of two factors, the product is same.

  4. Exchange

  5. Describe the situation with addition or multiplication. Addition： Multiplication ：

  6. Describe the situation with addition or multiplication. ( ) columns， ( ) in each column. Addition： 2+2+2+2+2+2+2+2=16 Multiplication ： 8×2= 2+2+2+2+2+2+2+2=16

  7. Describe the situation with addition or multiplication. ( ) rows， ( ) in each row. Addition： 8+8=16 2×8= 8+8=16 Multiplication ：

  8. 2+2+2+2+2+2+2+2=16 8×2=16 8+8=16 2×8=16 2+2+2+2+2+2+2+2=8×2=2×8=8+8=16

  9. Circle and fill in different way : How many stars in the picture？ 7×2=2+2+2+2+2+2+2=14 2×7=7+7=14 2+2+2+2+2+2+2= 7×2= 2×7= 7+7 = 14

  10. Which addition is handy? 2+2+2+2+2+2+2+2=8×2=2×8=8+8=16 2+2+2+2+2+2+2=7×2=2×7=7+7=14 Repeated 7 times Repeated one more time Repeated one more time Repeated 6 times What’s the purpose to learn Exchange? Using Exchange can solve what problem?

  11. Guided Practice 9 2 18 2 9 9 9 = = = 2+2+2+2+2+2+2+2+2= 3+3+3+3+3+3+3= 4+4+4+4+4+4= + × × + + 7 3 3 21 7 7 = = = 7 7 × × + + + = = 6 4 4 = 24 6 6 × × 6 6 6

  12. Write 2 multiplications according to the picture. 3×5=15 2×3=6 5×3=15 3×2=6

  13. Challge If I give you 12 circles, can you arrange them in 2 different ways and write the exchange sentences. □×□=□×□

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