Add 12/14 and 21/18
1st number: 12/14, 2nd number: 1 3/18
12/14 + 21/18 is 85/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 14 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 14 × 9 = 126,
12/14 = 12 × 9/14 × 9 = 108/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
21/18 = 21 × 7/18 × 7 = 147/126 - Add the two like fractions:
108/126 + 147/126 = 108 + 147/126 = 255/126 - 255/126 simplified gives 85/42
- So, 12/14 + 21/18 = 85/42
In mixed form: 21/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/14+21/18 12/14+42/18 12/28+21/18 12/14+21/36 36/14+21/18 12/14+63/18 12/42+21/18 12/14+21/54 60/14+21/18 12/70+21/18 12/14+21/90 84/14+21/18 12/98+21/18