Solutions by everydaycalculation.com

15 - 68 is -1120.

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

LCM of 5 and 8 is**40**

Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 5 × 8 = 40,

15 = 1 × 85 × 8 = 840 - Likewise, for the 2nd fraction, since 8 × 5 = 40,

68 = 6 × 58 × 5 = 3040 - Subtract the two like fractions:

840 - 3040 = 8 - 3040 = -2240 - After reducing the fraction, the answer is -1120

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