Add 21/12 and 27/24
1st number: 1 9/12, 2nd number: 1 3/24
21/12 + 27/24 is 23/8.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 24 is 24
Next, find the equivalent fraction of both fractional numbers with denominator 24 - For the 1st fraction, since 12 × 2 = 24,
21/12 = 21 × 2/12 × 2 = 42/24 - Likewise, for the 2nd fraction, since 24 × 1 = 24,
27/24 = 27 × 1/24 × 1 = 27/24 - Add the two like fractions:
42/24 + 27/24 = 42 + 27/24 = 69/24 - 69/24 simplified gives 23/8
- So, 21/12 + 27/24 = 23/8
In mixed form: 27/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/12+27/24 21/12+54/24 21/24+27/24 21/12+27/48 63/12+27/24 21/12+81/24 21/36+27/24 21/12+27/72 21/60+27/24 21/84+27/24