Add 20/80 and 75/81
20/80 + 75/81 is 127/108.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 81 is 6480
Next, find the equivalent fraction of both fractional numbers with denominator 6480 - For the 1st fraction, since 80 × 81 = 6480,
20/80 = 20 × 81/80 × 81 = 1620/6480 - Likewise, for the 2nd fraction, since 81 × 80 = 6480,
75/81 = 75 × 80/81 × 80 = 6000/6480 - Add the two like fractions:
1620/6480 + 6000/6480 = 1620 + 6000/6480 = 7620/6480 - 7620/6480 simplified gives 127/108
- So, 20/80 + 75/81 = 127/108
In mixed form: 119/108
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/80+75/81 60/80+75/81