Add 18/42 and 42/18
1st number: 18/42, 2nd number: 2 6/18
18/42 + 42/18 is 58/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 42 × 3 = 126,
18/42 = 18 × 3/42 × 3 = 54/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
42/18 = 42 × 7/18 × 7 = 294/126 - Add the two like fractions:
54/126 + 294/126 = 54 + 294/126 = 348/126 - 348/126 simplified gives 58/21
- So, 18/42 + 42/18 = 58/21
In mixed form: 216/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/42+42/18 18/42+84/18 18/84+42/18 18/42+42/36 54/42+42/18 18/42+42/54 90/42+42/18 18/42+42/90