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The product of a sum and a difference with 31 times 29 is:

(30+1) x (30-1)

sum to difference

make

a product

= 30² - 1²

= 900 - 1

= 899

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2010-01-04 17:01:41
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Q: Use the product of a sum and a difference to evaluate the expression 31 times 29?
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