Posted by **Bart** on Saturday, April 17, 2010 at 10:31pm.

Use front-end estimation to find the value of the expression. I do not understand (without adjustment)

687 - 239 (without adjustment)

is this right?

600 + 200= 800 + 126=926

- math Did I do it right? -
**Ms. Sue**, Saturday, April 17, 2010 at 10:44pm
If your problem is 687 - 239, it makes sense to me to do it this way:

700 = 200 = 500

- math Did I do it right? -
**Ms. Sue**, Saturday, April 17, 2010 at 10:49pm
Correction:

700 - 200 = 500

- Ms. Sue -
**Bart**, Saturday, April 17, 2010 at 10:54pm
Right it was subtraction. So what does "without adjustment" mean?

- math Did I do it right? -
**Ms. Sue**, Saturday, April 17, 2010 at 11:03pm
I'm not a math teacher -- but I assume you don't need to adjust for the small differences between your estimated numbers and the actual numbers.

This site may explain it.

http://mathforum.org/library/drmath/view/65415.html

- math Did I do it right? -
**Bart**, Saturday, April 17, 2010 at 11:54pm
Thank you

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