Solutions by everydaycalculation.com

78 - 39 is 1324.

- Find the least common denominator or LCM of the two denominators:

LCM of 8 and 9 is**72**

Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 8 × 9 = 72,

78 = 7 × 98 × 9 = 6372 - Likewise, for the 2nd fraction, since 9 × 8 = 72,

39 = 3 × 89 × 8 = 2472 - Subtract the two like fractions:

6372 - 2472 = 63 - 2472 = 3972 - After reducing the fraction, the answer is 1324

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