Add 30/80 and 20/81
30/80 + 20/81 is 403/648.
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,
30/80 = 30 × 81/80 × 81 = 2430/6480 - Likewise, for the 2nd fraction, since 81 × 80 = 6480,
20/81 = 20 × 80/81 × 80 = 1600/6480 - Add the two like fractions:
2430/6480 + 1600/6480 = 2430 + 1600/6480 = 4030/6480 - 4030/6480 simplified gives 403/648
- So, 30/80 + 20/81 = 403/648
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/80+20/81 30/80+40/81 90/80+20/81 30/80+60/81