Add 21/12 and 3/24
1st number: 1 9/12, 2nd number: 3/24
21/12 + 3/24 is 15/8.
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,
3/24 = 3 × 1/24 × 1 = 3/24 - Add the two like fractions:
42/24 + 3/24 = 42 + 3/24 = 45/24 - 45/24 simplified gives 15/8
- So, 21/12 + 3/24 = 15/8
In mixed form: 17/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/12+3/24 21/12+6/24 21/24+3/24 21/12+3/48 63/12+3/24 21/12+9/24 21/36+3/24 21/12+3/72 21/12+15/24 21/60+3/24 21/12+21/24 21/84+3/24