Add 12/9 and 18/42
1st number: 1 3/9, 2nd number: 18/42
12/9 + 18/42 is 37/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 42 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 9 × 14 = 126,
12/9 = 12 × 14/9 × 14 = 168/126 - Likewise, for the 2nd fraction, since 42 × 3 = 126,
18/42 = 18 × 3/42 × 3 = 54/126 - Add the two like fractions:
168/126 + 54/126 = 168 + 54/126 = 222/126 - 222/126 simplified gives 37/21
- So, 12/9 + 18/42 = 37/21
In mixed form: 116/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/9+18/42 12/9+36/42 12/18+18/42 12/9+18/84 36/9+18/42 12/9+54/42 12/27+18/42 60/9+18/42 12/9+90/42 12/45+18/42 84/9+18/42 12/63+18/42