Add 15/21 and 28/60
15/21 + 28/60 is 124/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 60 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 21 × 20 = 420,
15/21 = 15 × 20/21 × 20 = 300/420 - Likewise, for the 2nd fraction, since 60 × 7 = 420,
28/60 = 28 × 7/60 × 7 = 196/420 - Add the two like fractions:
300/420 + 196/420 = 300 + 196/420 = 496/420 - 496/420 simplified gives 124/105
- So, 15/21 + 28/60 = 124/105
In mixed form: 119/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/21+28/60 15/21+56/60 15/42+28/60 45/21+28/60 15/21+84/60 15/63+28/60 75/21+28/60