Add 20/27 and 21/12
1st number: 20/27, 2nd number: 1 9/12
20/27 + 21/12 is 269/108.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 12 is 108
Next, find the equivalent fraction of both fractional numbers with denominator 108 - For the 1st fraction, since 27 × 4 = 108,
20/27 = 20 × 4/27 × 4 = 80/108 - Likewise, for the 2nd fraction, since 12 × 9 = 108,
21/12 = 21 × 9/12 × 9 = 189/108 - Add the two like fractions:
80/108 + 189/108 = 80 + 189/108 = 269/108 - So, 20/27 + 21/12 = 269/108
In mixed form: 253/108
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/27+21/12 20/27+42/12 20/54+21/12 20/27+21/24 60/27+21/12 20/27+63/12 20/81+21/12 20/27+21/36 20/27+21/60 20/27+21/84