Add 8/84 and 21/15
1st number: 8/84, 2nd number: 1 6/15
8/84 + 21/15 is 157/105.
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,
8/84 = 8 × 5/84 × 5 = 40/420 - Likewise, for the 2nd fraction, since 15 × 28 = 420,
21/15 = 21 × 28/15 × 28 = 588/420 - Add the two like fractions:
40/420 + 588/420 = 40 + 588/420 = 628/420 - 628/420 simplified gives 157/105
- So, 8/84 + 21/15 = 157/105
In mixed form: 152/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/84+21/15 8/84+42/15 8/84+21/30 24/84+21/15 8/84+63/15 8/84+21/45 40/84+21/15 8/84+21/75 56/84+21/15