Add 1/15 and 21/84
1/15 + 21/84 is 19/60.
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,
1/15 = 1 × 28/15 × 28 = 28/420 - Likewise, for the 2nd fraction, since 84 × 5 = 420,
21/84 = 21 × 5/84 × 5 = 105/420 - Add the two like fractions:
28/420 + 105/420 = 28 + 105/420 = 133/420 - 133/420 simplified gives 19/60
- So, 1/15 + 21/84 = 19/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/15+21/84 1/15+42/84 1/30+21/84 3/15+21/84 1/15+63/84 1/45+21/84 5/15+21/84 1/75+21/84 7/15+21/84