Add 15/28 and 21/84
15/28 + 21/84 is 11/14.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 84 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 28 × 3 = 84,
15/28 = 15 × 3/28 × 3 = 45/84 - Likewise, for the 2nd fraction, since 84 × 1 = 84,
21/84 = 21 × 1/84 × 1 = 21/84 - Add the two like fractions:
45/84 + 21/84 = 45 + 21/84 = 66/84 - 66/84 simplified gives 11/14
- So, 15/28 + 21/84 = 11/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/28+21/84 15/28+42/84 15/56+21/84 45/28+21/84 15/28+63/84 15/84+21/84 75/28+21/84