Add 30/9 and 21/30
1st number: 3 3/9, 2nd number: 21/30
30/9 + 21/30 is 121/30.
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,
30/9 = 30 × 10/9 × 10 = 300/90 - Likewise, for the 2nd fraction, since 30 × 3 = 90,
21/30 = 21 × 3/30 × 3 = 63/90 - Add the two like fractions:
300/90 + 63/90 = 300 + 63/90 = 363/90 - 363/90 simplified gives 121/30
- So, 30/9 + 21/30 = 121/30
In mixed form: 41/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/9+21/30 30/9+42/30 30/18+21/30 30/9+21/60 90/9+21/30 30/9+63/30 30/27+21/30 30/9+21/90 30/45+21/30 30/63+21/30