Add 12/30 and 21/9
1st number: 12/30, 2nd number: 2 3/9
12/30 + 21/9 is 41/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 9 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 30 × 3 = 90,
12/30 = 12 × 3/30 × 3 = 36/90 - Likewise, for the 2nd fraction, since 9 × 10 = 90,
21/9 = 21 × 10/9 × 10 = 210/90 - Add the two like fractions:
36/90 + 210/90 = 36 + 210/90 = 246/90 - 246/90 simplified gives 41/15
- So, 12/30 + 21/9 = 41/15
In mixed form: 211/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/30+21/9 12/30+42/9 12/60+21/9 12/30+21/18 36/30+21/9 12/30+63/9 12/90+21/9 12/30+21/27 60/30+21/9 12/30+21/45 84/30+21/9 12/30+21/63