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Catalina multiplied 842 and 3 and got 3,326. how can can she check to see if her answer is reasonable

Sagot :

Addinewbyidn
by rounding 842 to 800, she can multiply 800 by 3 to get 2,400.

then, multiply 40 by 3, you get 120 and add the two together to get 2,520

this shows her answer is not necessary reasonable
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