Add 21/80 and 84/20
1st number: 21/80, 2nd number: 4 4/20
21/80 + 84/20 is 357/80.
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,
84/20 = 84 × 4/20 × 4 = 336/80 - Add the two like fractions:
21/80 + 336/80 = 21 + 336/80 = 357/80 - So, 21/80 + 84/20 = 357/80
In mixed form: 437/80
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/80+84/20 21/80+84/40 63/80+84/20 21/80+84/60