Solutions by everydaycalculation.com

39 - 810 is -715.

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

LCM of 9 and 10 is**90**

Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 9 × 10 = 90,

39 = 3 × 109 × 10 = 3090 - Likewise, for the 2nd fraction, since 10 × 9 = 90,

810 = 8 × 910 × 9 = 7290 - Subtract the two like fractions:

3090 - 7290 = 30 - 7290 = -4290 - After reducing the fraction, the answer is -715

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