Add 15/21 and 3/60
15/21 + 3/60 is 107/140.
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,
3/60 = 3 × 7/60 × 7 = 21/420 - Add the two like fractions:
300/420 + 21/420 = 300 + 21/420 = 321/420 - 321/420 simplified gives 107/140
- So, 15/21 + 3/60 = 107/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/21+3/60 15/21+6/60 15/42+3/60 45/21+3/60 15/21+9/60 15/63+3/60 75/21+3/60 15/21+15/60 15/21+21/60