Add 18/7 and 21/54
1st number: 2 4/7, 2nd number: 21/54
18/7 + 21/54 is 373/126.
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,
18/7 = 18 × 54/7 × 54 = 972/378 - Likewise, for the 2nd fraction, since 54 × 7 = 378,
21/54 = 21 × 7/54 × 7 = 147/378 - Add the two like fractions:
972/378 + 147/378 = 972 + 147/378 = 1119/378 - 1119/378 simplified gives 373/126
- So, 18/7 + 21/54 = 373/126
In mixed form: 2121/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/7+21/54 18/7+42/54 18/14+21/54 54/7+21/54 18/7+63/54 18/21+21/54 90/7+21/54 18/35+21/54 18/49+21/54