Add 20/21 and 15/60
20/21 + 15/60 is 101/84.
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,
20/21 = 20 × 20/21 × 20 = 400/420 - Likewise, for the 2nd fraction, since 60 × 7 = 420,
15/60 = 15 × 7/60 × 7 = 105/420 - Add the two like fractions:
400/420 + 105/420 = 400 + 105/420 = 505/420 - 505/420 simplified gives 101/84
- So, 20/21 + 15/60 = 101/84
In mixed form: 117/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/21+15/60 20/21+30/60 20/42+15/60 60/21+15/60 20/21+45/60 20/63+15/60 20/21+75/60