Add 15/10 and 21/20
1st number: 1 5/10, 2nd number: 1 1/20
15/10 + 21/20 is 51/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 20 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 10 × 2 = 20,
15/10 = 15 × 2/10 × 2 = 30/20 - Likewise, for the 2nd fraction, since 20 × 1 = 20,
21/20 = 21 × 1/20 × 1 = 21/20 - Add the two like fractions:
30/20 + 21/20 = 30 + 21/20 = 51/20 - So, 15/10 + 21/20 = 51/20
In mixed form: 211/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/10+21/20 15/10+42/20 15/20+21/20 15/10+21/40 45/10+21/20 15/10+63/20 15/30+21/20 15/10+21/60 75/10+21/20 15/50+21/20 15/70+21/20