Subtract 5/56 from 42/81
42/81 - 5/56 is 649/1512.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 56 is 4536
Next, find the equivalent fraction of both fractional numbers with denominator 4536 - For the 1st fraction, since 81 × 56 = 4536,
42/81 = 42 × 56/81 × 56 = 2352/4536 - Likewise, for the 2nd fraction, since 56 × 81 = 4536,
5/56 = 5 × 81/56 × 81 = 405/4536 - Subtract the two like fractions:
2352/4536 - 405/4536 = 2352 - 405/4536 = 1947/4536 - After reducing the fraction, the answer is 649/1512
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/81-5/56 42/81-10/56 42/81-15/56 42/81-25/56 42/81-35/56