Add 18/42 and 9/12
18/42 + 9/12 is 33/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 12 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 42 × 2 = 84,
18/42 = 18 × 2/42 × 2 = 36/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
9/12 = 9 × 7/12 × 7 = 63/84 - Add the two like fractions:
36/84 + 63/84 = 36 + 63/84 = 99/84 - 99/84 simplified gives 33/28
- So, 18/42 + 9/12 = 33/28
In mixed form: 15/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/42+9/12 18/42+18/12 18/84+9/12 18/42+9/24 54/42+9/12 18/42+27/12 18/42+9/36 90/42+9/12 18/42+45/12 18/42+9/60 18/42+63/12 18/42+9/84