Add 15/30 and 21/24
15/30 + 21/24 is 11/8.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 24 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 30 × 4 = 120,
15/30 = 15 × 4/30 × 4 = 60/120 - Likewise, for the 2nd fraction, since 24 × 5 = 120,
21/24 = 21 × 5/24 × 5 = 105/120 - Add the two like fractions:
60/120 + 105/120 = 60 + 105/120 = 165/120 - 165/120 simplified gives 11/8
- So, 15/30 + 21/24 = 11/8
In mixed form: 13/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 15/30+42/24 15/60+21/24 15/30+21/48 45/30+21/24 15/30+63/24 15/90+21/24 15/30+21/72 75/30+21/24