Add 15/84 and 21/36
15/84 + 21/36 is 16/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 36 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 84 × 3 = 252,
15/84 = 15 × 3/84 × 3 = 45/252 - Likewise, for the 2nd fraction, since 36 × 7 = 252,
21/36 = 21 × 7/36 × 7 = 147/252 - Add the two like fractions:
45/252 + 147/252 = 45 + 147/252 = 192/252 - 192/252 simplified gives 16/21
- So, 15/84 + 21/36 = 16/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/84+21/36 15/84+42/36 15/84+21/72 45/84+21/36 15/84+63/36 75/84+21/36