Add 35/15 and 21/84
1st number: 2 5/15, 2nd number: 21/84
35/15 + 21/84 is 31/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 84 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 15 × 28 = 420,
35/15 = 35 × 28/15 × 28 = 980/420 - Likewise, for the 2nd fraction, since 84 × 5 = 420,
21/84 = 21 × 5/84 × 5 = 105/420 - Add the two like fractions:
980/420 + 105/420 = 980 + 105/420 = 1085/420 - 1085/420 simplified gives 31/12
- So, 35/15 + 21/84 = 31/12
In mixed form: 27/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/15+21/84 35/15+42/84 35/30+21/84 35/15+63/84 35/45+21/84 35/75+21/84