Add 1/2 and 21/12
1st number: 1/2, 2nd number: 1 9/12
1/2 + 21/12 is 9/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 12 is 12
Next, find the equivalent fraction of both fractional numbers with denominator 12 - For the 1st fraction, since 2 × 6 = 12,
1/2 = 1 × 6/2 × 6 = 6/12 - Likewise, for the 2nd fraction, since 12 × 1 = 12,
21/12 = 21 × 1/12 × 1 = 21/12 - Add the two like fractions:
6/12 + 21/12 = 6 + 21/12 = 27/12 - 27/12 simplified gives 9/4
- So, 1/2 + 21/12 = 9/4
In mixed form: 21/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 1/2+42/12 1/4+21/12 1/2+21/24 3/2+21/12 1/2+63/12 1/6+21/12 1/2+21/36 5/2+21/12 1/10+21/12 1/2+21/60 7/2+21/12 1/14+21/12 1/2+21/84