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A. Multiply mentally. Fill in the blank with the product to complete each number sentence.
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| 1. |
36 × 10 =
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| 2. |
72 × 100 =
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| 3. |
89 × 1000 =
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| 4. |
64 × 10 000 =
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| 5. |
564 × 100 000 =
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| 6. |
40 × 80 =
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| 7. |
60 × 700 =
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| 8. |
30 × 900 =
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| 9. |
800 × 800 =
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B. Complete each equation to show how you can multiply mentally. Fill in the blank
with the correct answer.
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| 10. |
700 × 6000 =
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| 11. |
4 × 40 = 4 × (4 × ) =
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| 12. |
5 × 7 × 2 = (5 × ) × 7 =
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| 13. |
2 × 2 × 50 = (2 × ) × 2 =
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| 14. |
2 × 5 × 20 = 2 × (5 × ) =
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| 15. |
7 × 15 = (7 × ) + (7 × 5) =
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