Add 21/30 and 7/10
21/30 + 7/10 is 7/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 10 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 10 × 3 = 30,
7/10 = 7 × 3/10 × 3 = 21/30 - Add the two like fractions:
21/30 + 21/30 = 21 + 21/30 = 42/30 - 42/30 simplified gives 7/5
- So, 21/30 + 7/10 = 7/5
In mixed form: 12/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30+7/10 21/30+14/10 21/60+7/10 21/30+7/20 63/30+7/10 21/30+21/10 21/90+7/10 21/30+7/30 21/30+35/10 21/30+7/50 21/30+49/10 21/30+7/70