Add 21/7 and 42/54
1st number: 3 0/7, 2nd number: 42/54
21/7 + 42/54 is 34/9.
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,
42/54 = 42 × 7/54 × 7 = 294/378 - Add the two like fractions:
1134/378 + 294/378 = 1134 + 294/378 = 1428/378 - 1428/378 simplified gives 34/9
- So, 21/7 + 42/54 = 34/9
In mixed form: 37/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/7+42/54 21/7+84/54 21/14+42/54 63/7+42/54 21/35+42/54 21/49+42/54