Posted by **Nancy** on Wednesday, November 30, 2011 at 4:29pm.

Explain how you would use front-end 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.basic-mathematics.com/front-end-estimation.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 front-end 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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