Add 25/84 and 21/15
1st number: 25/84, 2nd number: 1 6/15
25/84 + 21/15 is 713/420.
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,
25/84 = 25 × 5/84 × 5 = 125/420 - Likewise, for the 2nd fraction, since 15 × 28 = 420,
21/15 = 21 × 28/15 × 28 = 588/420 - Add the two like fractions:
125/420 + 588/420 = 125 + 588/420 = 713/420 - So, 25/84 + 21/15 = 713/420
In mixed form: 1293/420
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/84+21/15 25/84+42/15 25/84+21/30 75/84+21/15 25/84+63/15 25/84+21/45 25/84+21/75