Add 25/15 and 21/84
1st number: 1 10/15, 2nd number: 21/84
25/15 + 21/84 is 23/12.
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,
25/15 = 25 × 28/15 × 28 = 700/420 - Likewise, for the 2nd fraction, since 84 × 5 = 420,
21/84 = 21 × 5/84 × 5 = 105/420 - Add the two like fractions:
700/420 + 105/420 = 700 + 105/420 = 805/420 - 805/420 simplified gives 23/12
- So, 25/15 + 21/84 = 23/12
In mixed form: 111/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/15+21/84 25/15+42/84 25/30+21/84 75/15+21/84 25/15+63/84 25/45+21/84 25/75+21/84