Solutions by everydaycalculation.com

820 - 6370 is -12.

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

LCM of 20 and 70 is**140**

Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 20 × 7 = 140,

820 = 8 × 720 × 7 = 56140 - Likewise, for the 2nd fraction, since 70 × 2 = 140,

6370 = 63 × 270 × 2 = 126140 - Subtract the two like fractions:

56140 - 126140 = 56 - 126140 = -70140 - After reducing the fraction, the answer is -12

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