Subtract 27/70 from 20/81
20/81 - 27/70 is -787/5670.
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,
20/81 = 20 × 70/81 × 70 = 1400/5670 - Likewise, for the 2nd fraction, since 70 × 81 = 5670,
27/70 = 27 × 81/70 × 81 = 2187/5670 - Subtract the two like fractions:
1400/5670 - 2187/5670 = 1400 - 2187/5670 = -787/5670
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