Add 20/80 and 45/81
20/80 + 45/81 is 29/36.
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,
45/81 = 45 × 80/81 × 80 = 3600/6480 - Add the two like fractions:
1620/6480 + 3600/6480 = 1620 + 3600/6480 = 5220/6480 - 5220/6480 simplified gives 29/36
- So, 20/80 + 45/81 = 29/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/80+45/81 20/80+90/81 60/80+45/81