Add 35/21 and 12/54
1st number: 1 14/21, 2nd number: 12/54
35/21 + 12/54 is 17/9.
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,
35/21 = 35 × 18/21 × 18 = 630/378 - Likewise, for the 2nd fraction, since 54 × 7 = 378,
12/54 = 12 × 7/54 × 7 = 84/378 - Add the two like fractions:
630/378 + 84/378 = 630 + 84/378 = 714/378 - 714/378 simplified gives 17/9
- So, 35/21 + 12/54 = 17/9
In mixed form: 18/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/21+12/54 35/21+24/54 35/42+12/54 35/21+36/54 35/63+12/54 35/21+60/54 35/21+84/54