Add 28/20 and 21/80
1st number: 1 8/20, 2nd number: 21/80
28/20 + 21/80 is 133/80.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 80 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 20 × 4 = 80,
28/20 = 28 × 4/20 × 4 = 112/80 - Likewise, for the 2nd fraction, since 80 × 1 = 80,
21/80 = 21 × 1/80 × 1 = 21/80 - Add the two like fractions:
112/80 + 21/80 = 112 + 21/80 = 133/80 - So, 28/20 + 21/80 = 133/80
In mixed form: 153/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/20+21/80 28/20+42/80 28/40+21/80 84/20+21/80 28/20+63/80 28/60+21/80