Add 18/21 and 28/18
1st number: 18/21, 2nd number: 1 10/18
18/21 + 28/18 is 152/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 21 × 6 = 126,
18/21 = 18 × 6/21 × 6 = 108/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
28/18 = 28 × 7/18 × 7 = 196/126 - Add the two like fractions:
108/126 + 196/126 = 108 + 196/126 = 304/126 - 304/126 simplified gives 152/63
- So, 18/21 + 28/18 = 152/63
In mixed form: 226/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/21+28/18 18/21+56/18 18/42+28/18 18/21+28/36 54/21+28/18 18/21+84/18 18/63+28/18 18/21+28/54 90/21+28/18 18/21+28/90