Subtract 10/45 from 20/81
20/81 - 10/45 is 2/81.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 45 is 405
Next, find the equivalent fraction of both fractional numbers with denominator 405 - For the 1st fraction, since 81 × 5 = 405,
20/81 = 20 × 5/81 × 5 = 100/405 - Likewise, for the 2nd fraction, since 45 × 9 = 405,
10/45 = 10 × 9/45 × 9 = 90/405 - Subtract the two like fractions:
100/405 - 90/405 = 100 - 90/405 = 10/405 - After reducing the fraction, the answer is 2/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/81-10/45 20/81-20/45 20/81-10/90 60/81-10/45 20/81-30/45 20/81-50/45 20/81-70/45