without multiplying, how do you know that the product of 399 and 48 is smaller than 20,722?

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1. what is 50x400?

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2. 20,000

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posted by dk
3. Since 399 is less than 400 and 48 is less than 50, then obviously the answer must be less than 20,000. Right?

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4. the world in the 1400s

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5. how can you show without multiplying that 4/9 is greater then 0.4

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posted by Juan

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