Subtract 7/81 from 27/42
27/42 - 7/81 is 631/1134.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 81 is 1134
Next, find the equivalent fraction of both fractional numbers with denominator 1134 - For the 1st fraction, since 42 × 27 = 1134,
27/42 = 27 × 27/42 × 27 = 729/1134 - Likewise, for the 2nd fraction, since 81 × 14 = 1134,
7/81 = 7 × 14/81 × 14 = 98/1134 - Subtract the two like fractions:
729/1134 - 98/1134 = 729 - 98/1134 = 631/1134
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/42-7/81 27/42-14/81 27/84-7/81 81/42-7/81 27/42-21/81 27/42-35/81 27/42-49/81