Add 80/84 and 28/20
1st number: 80/84, 2nd number: 1 8/20
80/84 + 28/20 is 247/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 84 × 5 = 420,
80/84 = 80 × 5/84 × 5 = 400/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
28/20 = 28 × 21/20 × 21 = 588/420 - Add the two like fractions:
400/420 + 588/420 = 400 + 588/420 = 988/420 - 988/420 simplified gives 247/105
- So, 80/84 + 28/20 = 247/105
In mixed form: 237/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/84+56/20 80/84+28/40 80/84+84/20 80/84+28/60