Add 21/20 and 7/30
1st number: 1 1/20, 2nd number: 7/30
21/20 + 7/30 is 77/60.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 30 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 20 × 3 = 60,
21/20 = 21 × 3/20 × 3 = 63/60 - Likewise, for the 2nd fraction, since 30 × 2 = 60,
7/30 = 7 × 2/30 × 2 = 14/60 - Add the two like fractions:
63/60 + 14/60 = 63 + 14/60 = 77/60 - So, 21/20 + 7/30 = 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: 42/20+7/30 21/20+14/30 21/40+7/30 21/20+7/60 63/20+7/30 21/20+21/30 21/60+7/30 21/20+7/90 21/20+35/30 21/20+49/30