Solutions by everydaycalculation.com

15 - 39 is -215.

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

LCM of 5 and 9 is**45**

Next, find the equivalent fraction of both fractional numbers with denominator 45 - For the 1st fraction, since 5 × 9 = 45,

15 = 1 × 95 × 9 = 945 - Likewise, for the 2nd fraction, since 9 × 5 = 45,

39 = 3 × 59 × 5 = 1545 - Subtract the two like fractions:

945 - 1545 = 9 - 1545 = -645 - After reducing the fraction, the answer is -215

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