Add 21/12 and 9/27
1st number: 1 9/12, 2nd number: 9/27
21/12 + 9/27 is 25/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 27 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 27 × 4 = 108,
9/27 = 9 × 4/27 × 4 = 36/108 - Add the two like fractions:
189/108 + 36/108 = 189 + 36/108 = 225/108 - 225/108 simplified gives 25/12
- So, 21/12 + 9/27 = 25/12
In mixed form: 21/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/12+9/27 21/12+18/27 21/24+9/27 21/12+9/54 63/12+9/27 21/36+9/27 21/12+9/81 21/12+45/27 21/60+9/27 21/12+63/27 21/84+9/27