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math Did I do it right?

posted by on .

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? - ,

    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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