Solutions by everydaycalculation.com

18 - 710 is -2340.

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

LCM of 8 and 10 is**40**

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

18 = 1 × 58 × 5 = 540 - Likewise, for the 2nd fraction, since 10 × 4 = 40,

710 = 7 × 410 × 4 = 2840 - Subtract the two like fractions:

540 - 2840 = 5 - 2840 = -2340

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