Add 15/21 and 27/60
15/21 + 27/60 is 163/140.
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,
27/60 = 27 × 7/60 × 7 = 189/420 - Add the two like fractions:
300/420 + 189/420 = 300 + 189/420 = 489/420 - 489/420 simplified gives 163/140
- So, 15/21 + 27/60 = 163/140
In mixed form: 123/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/21+27/60 15/21+54/60 15/42+27/60 45/21+27/60 15/21+81/60 15/63+27/60 75/21+27/60