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Explain how using basic facts can help you find 10x20x30x40 mentally

Explain how using basic facts can help you find 10x20x30x40 mentally
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Explain how using basic facts can help you find 10x20x30x40 mentally

User DutGRIFF
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you can just multiply (for example) 1 times ten then add a zero at the end. please tell me if this helped or not
User Bdumitriu
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