Add 21/3 and 15/30
1st number: 7 0/3, 2nd number: 15/30
21/3 + 15/30 is 15/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 30 is 30
Next, find the equivalent fraction of both fractional numbers with denominator 30 - For the 1st fraction, since 3 × 10 = 30,
21/3 = 21 × 10/3 × 10 = 210/30 - Likewise, for the 2nd fraction, since 30 × 1 = 30,
15/30 = 15 × 1/30 × 1 = 15/30 - Add the two like fractions:
210/30 + 15/30 = 210 + 15/30 = 225/30 - 225/30 simplified gives 15/2
- So, 21/3 + 15/30 = 15/2
In mixed form: 71/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/3+15/30 21/6+15/30 21/3+15/60 63/3+15/30 21/3+45/30 21/9+15/30 21/3+15/90 21/3+75/30 21/15+15/30