Add 63/20 and 28/21
1st number: 3 3/20, 2nd number: 1 7/21
63/20 + 28/21 is 269/60.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 21 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
63/20 = 63 × 21/20 × 21 = 1323/420 - Likewise, for the 2nd fraction, since 21 × 20 = 420,
28/21 = 28 × 20/21 × 20 = 560/420 - Add the two like fractions:
1323/420 + 560/420 = 1323 + 560/420 = 1883/420 - 1883/420 simplified gives 269/60
- So, 63/20 + 28/21 = 269/60
In mixed form: 429/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/20+56/21 63/40+28/21 63/20+28/42 63/20+84/21 63/60+28/21 63/20+28/63