Solutions by everydaycalculation.com

78 - 910 is -140.

- 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,

78 = 7 × 58 × 5 = 3540 - Likewise, for the 2nd fraction, since 10 × 4 = 40,

910 = 9 × 410 × 4 = 3640 - Subtract the two like fractions:

3540 - 3640 = 35 - 3640 = -140

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