# math Did I do it right?

posted by .

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

is this right?

600 + 200= 800 + 126=926

• math Did I do it right? -

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? -

Correction:

700 - 200 = 500

• Ms. Sue -

Right it was subtraction. So what does "without adjustment" mean?

• math Did I do it right? -

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? -

Thank you

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