Add 21/60 and 28/9
1st number: 21/60, 2nd number: 3 1/9
21/60 + 28/9 is 623/180.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 60 and 9 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 60 × 3 = 180,
21/60 = 21 × 3/60 × 3 = 63/180 - Likewise, for the 2nd fraction, since 9 × 20 = 180,
28/9 = 28 × 20/9 × 20 = 560/180 - Add the two like fractions:
63/180 + 560/180 = 63 + 560/180 = 623/180 - So, 21/60 + 28/9 = 623/180
In mixed form: 383/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/60+28/9 21/60+56/9 21/60+28/18 63/60+28/9 21/60+84/9 21/60+28/27 21/60+28/45 21/60+28/63