Add 21/80 and 21/20
1st number: 21/80, 2nd number: 1 1/20
21/80 + 21/20 is 21/16.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 20 is 80
Next, find the equivalent fraction of both fractional numbers with denominator 80 - For the 1st fraction, since 80 × 1 = 80,
21/80 = 21 × 1/80 × 1 = 21/80 - Likewise, for the 2nd fraction, since 20 × 4 = 80,
21/20 = 21 × 4/20 × 4 = 84/80 - Add the two like fractions:
21/80 + 84/80 = 21 + 84/80 = 105/80 - 105/80 simplified gives 21/16
- So, 21/80 + 21/20 = 21/16
In mixed form: 15/16
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/80+21/20 21/80+42/20 21/80+21/40 63/80+21/20 21/80+63/20 21/80+21/60