Add 21/60 and 3/15
21/60 + 3/15 is 11/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 60 and 15 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 60 × 1 = 60,
21/60 = 21 × 1/60 × 1 = 21/60 - Likewise, for the 2nd fraction, since 15 × 4 = 60,
3/15 = 3 × 4/15 × 4 = 12/60 - Add the two like fractions:
21/60 + 12/60 = 21 + 12/60 = 33/60 - 33/60 simplified gives 11/20
- So, 21/60 + 3/15 = 11/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/60+3/15 21/60+6/15 21/60+3/30 63/60+3/15 21/60+9/15 21/60+3/45 21/60+3/75 21/60+21/15