Add 63/20 and 30/21
1st number: 3 3/20, 2nd number: 1 9/21
63/20 + 30/21 is 641/140.
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,
30/21 = 30 × 20/21 × 20 = 600/420 - Add the two like fractions:
1323/420 + 600/420 = 1323 + 600/420 = 1923/420 - 1923/420 simplified gives 641/140
- So, 63/20 + 30/21 = 641/140
In mixed form: 481/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/20+60/21 63/40+30/21 63/20+30/42 63/20+90/21 63/60+30/21 63/20+30/63