Solutions by everydaycalculation.com

27 - 810 is -1835.

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

LCM of 7 and 10 is**70**

Next, find the equivalent fraction of both fractional numbers with denominator 70 - For the 1st fraction, since 7 × 10 = 70,

27 = 2 × 107 × 10 = 2070 - Likewise, for the 2nd fraction, since 10 × 7 = 70,

810 = 8 × 710 × 7 = 5670 - Subtract the two like fractions:

2070 - 5670 = 20 - 5670 = -3670 - After reducing the fraction, the answer is -1835

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