Subtract 21/20 from 30/15
1st number: 2 0/15, 2nd number: 1 1/20
30/15 - 21/20 is 19/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 20 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 15 × 4 = 60,
30/15 = 30 × 4/15 × 4 = 120/60 - Likewise, for the 2nd fraction, since 20 × 3 = 60,
21/20 = 21 × 3/20 × 3 = 63/60 - Subtract the two like fractions:
120/60 - 63/60 = 120 - 63/60 = 57/60 - After reducing the fraction, the answer is 19/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/15-21/20 30/15-42/20 30/15-21/40 90/15-21/20 30/15-63/20 30/45-21/20 30/15-21/60 30/75-21/20