Add 12/4 and 21/9
1st number: 3 0/4, 2nd number: 2 3/9
12/4 + 21/9 is 16/3.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 9 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 4 × 9 = 36,
12/4 = 12 × 9/4 × 9 = 108/36 - Likewise, for the 2nd fraction, since 9 × 4 = 36,
21/9 = 21 × 4/9 × 4 = 84/36 - Add the two like fractions:
108/36 + 84/36 = 108 + 84/36 = 192/36 - 192/36 simplified gives 16/3
- So, 12/4 + 21/9 = 16/3
In mixed form: 51/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/4+21/9 12/4+42/9 12/8+21/9 12/4+21/18 36/4+21/9 12/4+63/9 12/4+21/27 60/4+21/9 12/20+21/9 12/4+21/45 84/4+21/9 12/28+21/9 12/4+21/63