Add 3/12 and 21/3
1st number: 3/12, 2nd number: 7 0/3
3/12 + 21/3 is 29/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 3 is 12
Next, find the equivalent fraction of both fractional numbers with denominator 12 - For the 1st fraction, since 12 × 1 = 12,
3/12 = 3 × 1/12 × 1 = 3/12 - Likewise, for the 2nd fraction, since 3 × 4 = 12,
21/3 = 21 × 4/3 × 4 = 84/12 - Add the two like fractions:
3/12 + 84/12 = 3 + 84/12 = 87/12 - 87/12 simplified gives 29/4
- So, 3/12 + 21/3 = 29/4
In mixed form: 71/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/12+21/3 3/12+42/3 3/24+21/3 3/12+21/6 9/12+21/3 3/12+63/3 3/36+21/3 3/12+21/9 15/12+21/3 3/60+21/3 3/12+21/15 21/12+21/3 3/84+21/3