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Explain how you would use front-end estimation to subtract 189 from 643.

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640 - 190 = ?

http://www.aaamath.com/est73ax3.htm

http://www.basic-mathematics.com/front-end-estimation.html

how you would use front-end estimation to subtract 189 from 643 explain

i think it would be 990 or 1,000

estimate to sutract 189 from 643

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