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20-05-2019
Mathematics

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Estimate the product of 78×21, choose a method

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20-05-2019

Answer:

1638

Step-by-step explanation:

The best way, and the most used way is long multiplication. What you do is multiply parts of you number(like 78x1, and 78x20) and then add them together, not sure if it helps but here are some examples

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