Add 21/7 and 21/54
1st number: 3 0/7, 2nd number: 21/54
21/7 + 21/54 is 61/18.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 54 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 7 × 54 = 378,
21/7 = 21 × 54/7 × 54 = 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, 21/7 + 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: 42/7+21/54 21/7+42/54 21/14+21/54 63/7+21/54 21/7+63/54 21/35+21/54 21/49+21/54