Add 21/4 and 28/27
1st number: 5 1/4, 2nd number: 1 1/27
21/4 + 28/27 is 679/108.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 27 is 108
Next, find the equivalent fraction of both fractional numbers with denominator 108 - For the 1st fraction, since 4 × 27 = 108,
21/4 = 21 × 27/4 × 27 = 567/108 - Likewise, for the 2nd fraction, since 27 × 4 = 108,
28/27 = 28 × 4/27 × 4 = 112/108 - Add the two like fractions:
567/108 + 112/108 = 567 + 112/108 = 679/108 - So, 21/4 + 28/27 = 679/108
In mixed form: 631/108
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/4+28/27 21/4+56/27 21/8+28/27 21/4+28/54 63/4+28/27 21/4+84/27 21/12+28/27 21/4+28/81 21/20+28/27 21/28+28/27