Add 15/20 and 21/10
1st number: 15/20, 2nd number: 2 1/10
15/20 + 21/10 is 57/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 10 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 20 × 1 = 20,
15/20 = 15 × 1/20 × 1 = 15/20 - Likewise, for the 2nd fraction, since 10 × 2 = 20,
21/10 = 21 × 2/10 × 2 = 42/20 - Add the two like fractions:
15/20 + 42/20 = 15 + 42/20 = 57/20 - So, 15/20 + 21/10 = 57/20
In mixed form: 217/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/20+21/10 15/20+42/10 15/40+21/10 15/20+21/20 45/20+21/10 15/20+63/10 15/60+21/10 15/20+21/30 75/20+21/10 15/20+21/50 15/20+21/70