Posted by Nancy on Wednesday, November 30, 2011 at 4:29pm.
Explain how you would use frontend estimation to subtract 189 from 643.

4th grade  Ms. Sue, Wednesday, November 30, 2011 at 4:35pm
640  190 = ?
http://www.aaamath.com/est73ax3.htm
http://www.basicmathematics.com/frontendestimation.html

4th grade  Anonymous, Wednesday, September 12, 2012 at 9:32pm
dont know

math  ernesto, Tuesday, September 18, 2012 at 9:36pm
how you would use frontend estimation to subtract 189 from 643 explain

4th grade  Anonymous, Tuesday, November 6, 2012 at 2:15pm
i think it would be 990 or 1,000

4th grade  Anonymous, Tuesday, September 9, 2014 at 8:30pm
estimate to sutract 189 from 643
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