Solutions by everydaycalculation.com

78 - 6384 is 18.

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

LCM of 8 and 84 is**168**

Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 8 × 21 = 168,

78 = 7 × 218 × 21 = 147168 - Likewise, for the 2nd fraction, since 84 × 2 = 168,

6384 = 63 × 284 × 2 = 126168 - Subtract the two like fractions:

147168 - 126168 = 147 - 126168 = 21168 - After reducing the fraction, the answer is 18

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