Subtract 56/30 from 81/18
1st number: 4 9/18, 2nd number: 1 26/30
81/18 - 56/30 is 79/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 30 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 18 × 5 = 90,
81/18 = 81 × 5/18 × 5 = 405/90 - Likewise, for the 2nd fraction, since 30 × 3 = 90,
56/30 = 56 × 3/30 × 3 = 168/90 - Subtract the two like fractions:
405/90 - 168/90 = 405 - 168/90 = 237/90 - After reducing the fraction, the answer is 79/30
- In mixed form: 219/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/36-56/30 81/18-56/60 81/54-56/30 81/18-56/90 81/90-56/30