Add 21/30 and 7/15
21/30 + 7/15 is 7/6.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 15 is 30
Next, find the equivalent fraction of both fractional numbers with denominator 30 - For the 1st fraction, since 30 × 1 = 30,
21/30 = 21 × 1/30 × 1 = 21/30 - Likewise, for the 2nd fraction, since 15 × 2 = 30,
7/15 = 7 × 2/15 × 2 = 14/30 - Add the two like fractions:
21/30 + 14/30 = 21 + 14/30 = 35/30 - 35/30 simplified gives 7/6
- So, 21/30 + 7/15 = 7/6
In mixed form: 11/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30+7/15 21/30+14/15 21/60+7/15 21/30+7/30 63/30+7/15 21/30+21/15 21/90+7/15 21/30+7/45 21/30+35/15 21/30+7/75 21/30+49/15