Add 30/15 and 21/8
1st number: 2 0/15, 2nd number: 2 5/8
30/15 + 21/8 is 37/8.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 8 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 15 × 8 = 120,
30/15 = 30 × 8/15 × 8 = 240/120 - Likewise, for the 2nd fraction, since 8 × 15 = 120,
21/8 = 21 × 15/8 × 15 = 315/120 - Add the two like fractions:
240/120 + 315/120 = 240 + 315/120 = 555/120 - 555/120 simplified gives 37/8
- So, 30/15 + 21/8 = 37/8
In mixed form: 45/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/15+21/8 30/15+42/8 30/15+21/16 90/15+21/8 30/15+63/8 30/45+21/8 30/15+21/24 30/75+21/8 30/15+21/40 30/15+21/56