Add 1/15 and 21/20
1st number: 1/15, 2nd number: 1 1/20
1/15 + 21/20 is 67/60.
Steps for adding 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,
1/15 = 1 × 4/15 × 4 = 4/60 - Likewise, for the 2nd fraction, since 20 × 3 = 60,
21/20 = 21 × 3/20 × 3 = 63/60 - Add the two like fractions:
4/60 + 63/60 = 4 + 63/60 = 67/60 - So, 1/15 + 21/20 = 67/60
In mixed form: 17/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/15+21/20 1/15+42/20 1/30+21/20 1/15+21/40 3/15+21/20 1/15+63/20 1/45+21/20 1/15+21/60 5/15+21/20 1/75+21/20 7/15+21/20