Add 63/21 and 15/20
1st number: 3 0/21, 2nd number: 15/20
63/21 + 15/20 is 15/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 21 × 20 = 420,
63/21 = 63 × 20/21 × 20 = 1260/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
15/20 = 15 × 21/20 × 21 = 315/420 - Add the two like fractions:
1260/420 + 315/420 = 1260 + 315/420 = 1575/420 - 1575/420 simplified gives 15/4
- So, 63/21 + 15/20 = 15/4
In mixed form: 33/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/21+30/20 63/42+15/20 63/21+15/40 63/21+45/20 63/21+15/60 63/21+75/20