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Explain how using basic facts can help you find 10 x 20 x 30 x 40 mentally
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Explain how using basic facts can help you find 10 x 20 x 30 x 40 mentally

User Slinky
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10 x 20 x 30 x 40 = 24000
1 x 2 x 3 x 4 = 24
Count up the extra zeros, (20 30 40) and theres 3 extra zeros
Put them at the end of 24 to get the answer.
User Rajen
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