Add 21/20 and 28/27
1st number: 1 1/20, 2nd number: 1 1/27
21/20 + 28/27 is 1127/540.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 27 is 540
Next, find the equivalent fraction of both fractional numbers with denominator 540 - For the 1st fraction, since 20 × 27 = 540,
21/20 = 21 × 27/20 × 27 = 567/540 - Likewise, for the 2nd fraction, since 27 × 20 = 540,
28/27 = 28 × 20/27 × 20 = 560/540 - Add the two like fractions:
567/540 + 560/540 = 567 + 560/540 = 1127/540 - So, 21/20 + 28/27 = 1127/540
In mixed form: 247/540
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/20+28/27 21/20+56/27 21/40+28/27 21/20+28/54 63/20+28/27 21/20+84/27 21/60+28/27 21/20+28/81