Subtract 63/70 from 28/81
28/81 - 63/70 is -449/810.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 70 is 5670
Next, find the equivalent fraction of both fractional numbers with denominator 5670 - For the 1st fraction, since 81 × 70 = 5670,
28/81 = 28 × 70/81 × 70 = 1960/5670 - Likewise, for the 2nd fraction, since 70 × 81 = 5670,
63/70 = 63 × 81/70 × 81 = 5103/5670 - Subtract the two like fractions:
1960/5670 - 5103/5670 = 1960 - 5103/5670 = -3143/5670 - After reducing the fraction, the answer is -449/810
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