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I havent been in school for 30 years can someone please help. we are having trouble with subtracting fractions like: 8 1/9 - 1 6/7 = ?
Any help would help...thanks

  • math -

    Change the numbers to all fractions.
    8 1/9 = 73/9
    (That is 9x8 = 72 and that +1 = 73).
    1 6/7 = 13/7.
    Now find the common denominator of 9 and 7 which is 63 (I don't think there is a smaller number) and convert each of those numbers above into 63rds.
    73/9 = 511/63
    (63/9 = 7 and that x 73 = 511).
    13/7 = 117/63.
    Now you can subtract the numerators by 511-112 = 394/63. I don't think this number can be reduced.
    Check my work.

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