Subtract 18/30 from 56/21
1st number: 2 14/21, 2nd number: 18/30
56/21 - 18/30 is 31/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
56/21 = 56 × 10/21 × 10 = 560/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
18/30 = 18 × 7/30 × 7 = 126/210 - Subtract the two like fractions:
560/210 - 126/210 = 560 - 126/210 = 434/210 - After reducing the fraction, the answer is 31/15
- In mixed form: 21/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/21-36/30 56/42-18/30 56/21-18/60 56/21-54/30 56/63-18/30 56/21-18/90 56/21-90/30