Subtract 18/81 from 28/80
28/80 - 18/81 is 23/180.
Steps for subtracting 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,
28/80 = 28 × 81/80 × 81 = 2268/6480 - Likewise, for the 2nd fraction, since 81 × 80 = 6480,
18/81 = 18 × 80/81 × 80 = 1440/6480 - Subtract the two like fractions:
2268/6480 - 1440/6480 = 2268 - 1440/6480 = 828/6480 - After reducing the fraction, the answer is 23/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/80-18/81 28/80-36/81 84/80-18/81 28/80-54/81 28/80-90/81