Add 21/54 and 28/9
1st number: 21/54, 2nd number: 3 1/9
21/54 + 28/9 is 7/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 54 and 9 is 54
Next, find the equivalent fraction of both fractional numbers with denominator 54 - For the 1st fraction, since 54 × 1 = 54,
21/54 = 21 × 1/54 × 1 = 21/54 - Likewise, for the 2nd fraction, since 9 × 6 = 54,
28/9 = 28 × 6/9 × 6 = 168/54 - Add the two like fractions:
21/54 + 168/54 = 21 + 168/54 = 189/54 - 189/54 simplified gives 7/2
- So, 21/54 + 28/9 = 7/2
In mixed form: 31/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/54+28/9 21/54+56/9 21/54+28/18 63/54+28/9 21/54+84/9 21/54+28/27 21/54+28/45 21/54+28/63