Add 28/18 and 28/21
1st number: 1 10/18, 2nd number: 1 7/21
28/18 + 28/21 is 26/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 21 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 18 × 7 = 126,
28/18 = 28 × 7/18 × 7 = 196/126 - Likewise, for the 2nd fraction, since 21 × 6 = 126,
28/21 = 28 × 6/21 × 6 = 168/126 - Add the two like fractions:
196/126 + 168/126 = 196 + 168/126 = 364/126 - 364/126 simplified gives 26/9
- So, 28/18 + 28/21 = 26/9
In mixed form: 28/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/18+28/21 28/18+56/21 28/36+28/21 28/18+28/42 84/18+28/21 28/18+84/21 28/54+28/21 28/18+28/63 28/90+28/21