Subtract 20/81 from 3/70
3/70 - 20/81 is -1157/5670.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 81 is 5670
Next, find the equivalent fraction of both fractional numbers with denominator 5670 - For the 1st fraction, since 70 × 81 = 5670,
3/70 = 3 × 81/70 × 81 = 243/5670 - Likewise, for the 2nd fraction, since 81 × 70 = 5670,
20/81 = 20 × 70/81 × 70 = 1400/5670 - Subtract the two like fractions:
243/5670 - 1400/5670 = 243 - 1400/5670 = -1157/5670
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