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That's easy, just half it. 420 divided by 2 (5 is half of 10) which equals 210.

(1)

To check my answer, I did... 42

x5 (5 x 2=10 (carry the one), then 5 x 4=20 + 1= 120)

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210

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13y ago
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Q: How could you use the product 10x42 equals 420 to find the product of 5x42?
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