Add 18/21 and 42/14
1st number: 18/21, 2nd number: 3 0/14
18/21 + 42/14 is 27/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 14 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 21 × 2 = 42,
18/21 = 18 × 2/21 × 2 = 36/42 - Likewise, for the 2nd fraction, since 14 × 3 = 42,
42/14 = 42 × 3/14 × 3 = 126/42 - Add the two like fractions:
36/42 + 126/42 = 36 + 126/42 = 162/42 - 162/42 simplified gives 27/7
- So, 18/21 + 42/14 = 27/7
In mixed form: 36/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/21+42/14 18/21+84/14 18/42+42/14 18/21+42/28 54/21+42/14 18/63+42/14 90/21+42/14 18/21+42/70 18/21+42/98