Add 21/12 and 35/54
1st number: 1 9/12, 2nd number: 35/54
21/12 + 35/54 is 259/108.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 54 is 108
Next, find the equivalent fraction of both fractional numbers with denominator 108 - For the 1st fraction, since 12 × 9 = 108,
21/12 = 21 × 9/12 × 9 = 189/108 - Likewise, for the 2nd fraction, since 54 × 2 = 108,
35/54 = 35 × 2/54 × 2 = 70/108 - Add the two like fractions:
189/108 + 70/108 = 189 + 70/108 = 259/108 - So, 21/12 + 35/54 = 259/108
In mixed form: 243/108
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/12+35/54 21/12+70/54 21/24+35/54 63/12+35/54 21/36+35/54 21/60+35/54 21/84+35/54