Add 6/84 and 21/15
1st number: 6/84, 2nd number: 1 6/15
6/84 + 21/15 is 103/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 15 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 84 × 5 = 420,
6/84 = 6 × 5/84 × 5 = 30/420 - Likewise, for the 2nd fraction, since 15 × 28 = 420,
21/15 = 21 × 28/15 × 28 = 588/420 - Add the two like fractions:
30/420 + 588/420 = 30 + 588/420 = 618/420 - 618/420 simplified gives 103/70
- So, 6/84 + 21/15 = 103/70
In mixed form: 133/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/84+21/15 6/84+42/15 6/84+21/30 18/84+21/15 6/84+63/15 6/84+21/45 30/84+21/15 6/84+21/75 42/84+21/15