Add 3/21 and 28/18
1st number: 3/21, 2nd number: 1 10/18
3/21 + 28/18 is 107/63.
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,
3/21 = 3 × 6/21 × 6 = 18/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
28/18 = 28 × 7/18 × 7 = 196/126 - Add the two like fractions:
18/126 + 196/126 = 18 + 196/126 = 214/126 - 214/126 simplified gives 107/63
- So, 3/21 + 28/18 = 107/63
In mixed form: 144/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/21+28/18 3/21+56/18 3/42+28/18 3/21+28/36 9/21+28/18 3/21+84/18 3/63+28/18 3/21+28/54 15/21+28/18 3/21+28/90