Posted by Nancy on .
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