Add 63/21 and 21/54
1st number: 3 0/21, 2nd number: 21/54
63/21 + 21/54 is 61/18.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 54 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 21 × 18 = 378,
63/21 = 63 × 18/21 × 18 = 1134/378 - Likewise, for the 2nd fraction, since 54 × 7 = 378,
21/54 = 21 × 7/54 × 7 = 147/378 - Add the two like fractions:
1134/378 + 147/378 = 1134 + 147/378 = 1281/378 - 1281/378 simplified gives 61/18
- So, 63/21 + 21/54 = 61/18
In mixed form: 37/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/21+42/54 63/42+21/54 63/21+63/54