Add 21/15 and 35/30
1st number: 1 6/15, 2nd number: 1 5/30
21/15 + 35/30 is 77/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 30 is 30
Next, find the equivalent fraction of both fractional numbers with denominator 30 - For the 1st fraction, since 15 × 2 = 30,
21/15 = 21 × 2/15 × 2 = 42/30 - Likewise, for the 2nd fraction, since 30 × 1 = 30,
35/30 = 35 × 1/30 × 1 = 35/30 - Add the two like fractions:
42/30 + 35/30 = 42 + 35/30 = 77/30 - So, 21/15 + 35/30 = 77/30
In mixed form: 217/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/15+35/30 21/15+70/30 21/30+35/30 21/15+35/60 63/15+35/30 21/45+35/30 21/15+35/90 21/75+35/30