Add 21/20 and 28/30
1st number: 1 1/20, 2nd number: 28/30
21/20 + 28/30 is 119/60.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 30 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 20 × 3 = 60,
21/20 = 21 × 3/20 × 3 = 63/60 - Likewise, for the 2nd fraction, since 30 × 2 = 60,
28/30 = 28 × 2/30 × 2 = 56/60 - Add the two like fractions:
63/60 + 56/60 = 63 + 56/60 = 119/60 - So, 21/20 + 28/30 = 119/60
In mixed form: 159/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/20+28/30 21/20+56/30 21/40+28/30 21/20+28/60 63/20+28/30 21/20+84/30 21/60+28/30 21/20+28/90