Add 7/30 and 21/20
1st number: 7/30, 2nd number: 1 1/20
7/30 + 21/20 is 77/60.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 20 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 30 × 2 = 60,
7/30 = 7 × 2/30 × 2 = 14/60 - Likewise, for the 2nd fraction, since 20 × 3 = 60,
21/20 = 21 × 3/20 × 3 = 63/60 - Add the two like fractions:
14/60 + 63/60 = 14 + 63/60 = 77/60 - So, 7/30 + 21/20 = 77/60
In mixed form: 117/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/30+21/20 7/30+42/20 7/60+21/20 7/30+21/40 21/30+21/20 7/30+63/20 7/90+21/20 7/30+21/60 35/30+21/20 49/30+21/20