Add 28/15 and 81/28
1st number: 1 13/15, 2nd number: 2 25/28
28/15 + 81/28 is 1999/420.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 28 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 15 × 28 = 420,
28/15 = 28 × 28/15 × 28 = 784/420 - Likewise, for the 2nd fraction, since 28 × 15 = 420,
81/28 = 81 × 15/28 × 15 = 1215/420 - Add the two like fractions:
784/420 + 1215/420 = 784 + 1215/420 = 1999/420 - So, 28/15 + 81/28 = 1999/420
In mixed form: 4319/420
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/15+81/28 28/30+81/28 28/15+81/56 84/15+81/28 28/45+81/28 28/15+81/84 28/75+81/28