Add 15/60 and 21/20
1st number: 15/60, 2nd number: 1 1/20
15/60 + 21/20 is 13/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 60 and 20 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 60 × 1 = 60,
15/60 = 15 × 1/60 × 1 = 15/60 - Likewise, for the 2nd fraction, since 20 × 3 = 60,
21/20 = 21 × 3/20 × 3 = 63/60 - Add the two like fractions:
15/60 + 63/60 = 15 + 63/60 = 78/60 - 78/60 simplified gives 13/10
- So, 15/60 + 21/20 = 13/10
In mixed form: 13/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/60+21/20 15/60+42/20 15/60+21/40 45/60+21/20 15/60+63/20 15/60+21/60 75/60+21/20