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