Subtract 21/60 from 4/81
4/81 - 21/60 is -487/1620.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 60 is 1620
Next, find the equivalent fraction of both fractional numbers with denominator 1620 - For the 1st fraction, since 81 × 20 = 1620,
4/81 = 4 × 20/81 × 20 = 80/1620 - Likewise, for the 2nd fraction, since 60 × 27 = 1620,
21/60 = 21 × 27/60 × 27 = 567/1620 - Subtract the two like fractions:
80/1620 - 567/1620 = 80 - 567/1620 = -487/1620
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