Subtract 21/81 from 56/42
1st number: 1 14/42, 2nd number: 21/81
56/42 - 21/81 is 29/27.
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,
56/42 = 56 × 27/42 × 27 = 1512/1134 - Likewise, for the 2nd fraction, since 81 × 14 = 1134,
21/81 = 21 × 14/81 × 14 = 294/1134 - Subtract the two like fractions:
1512/1134 - 294/1134 = 1512 - 294/1134 = 1218/1134 - After reducing the fraction, the answer is 29/27
- In mixed form: 12/27
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/42-42/81 56/84-21/81 56/42-63/81