Add 7/9 and 21/30
7/9 + 21/30 is 133/90.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 30 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 9 × 10 = 90,
7/9 = 7 × 10/9 × 10 = 70/90 - Likewise, for the 2nd fraction, since 30 × 3 = 90,
21/30 = 21 × 3/30 × 3 = 63/90 - Add the two like fractions:
70/90 + 63/90 = 70 + 63/90 = 133/90 - So, 7/9 + 21/30 = 133/90
In mixed form: 143/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/9+21/30 7/9+42/30 7/18+21/30 7/9+21/60 21/9+21/30 7/9+63/30 7/27+21/30 7/9+21/90 35/9+21/30 7/45+21/30 49/9+21/30 7/63+21/30