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I would multiply 2 by 5 first. The reason is that it leaves me with 10 and ten is an exceptionally easy number to multiply by whatever remains (3).

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12y ago

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How to explain why numbers are a factor pair?

Factors come in pairs because it is necessary to multiply something by something else to obtain a product.


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The product is the answer you get when you multiply two numbers. The two numbers are called factors. The number the factors make when you multiply them is called the product


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Factors are numbers that multiply to get a product. 7 and 9 are factors of 63.


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