4th grade
posted by Nancy .
Explain how you would use frontend estimation to subtract 189 from 643.

4th grade 
Ms. Sue
640  190 = ?
http://www.aaamath.com/est73ax3.htm
http://www.basicmathematics.com/frontendestimation.html 
4th grade 
Anonymous
dont know

math 
ernesto
how you would use frontend estimation to subtract 189 from 643 explain

4th grade 
Anonymous
i think it would be 990 or 1,000

4th grade 
Anonymous
estimate to sutract 189 from 643
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