Subtract 1/20 from 10/81
10/81 - 1/20 is 119/1620.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 20 is 1620
Next, find the equivalent fraction of both fractional numbers with denominator 1620 - For the 1st fraction, since 81 × 20 = 1620,
10/81 = 10 × 20/81 × 20 = 200/1620 - Likewise, for the 2nd fraction, since 20 × 81 = 1620,
1/20 = 1 × 81/20 × 81 = 81/1620 - Subtract the two like fractions:
200/1620 - 81/1620 = 200 - 81/1620 = 119/1620
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/81-1/20 10/81-2/20 10/81-1/40 30/81-1/20 10/81-3/20 10/81-1/60 50/81-1/20 10/81-5/20 70/81-1/20 10/81-7/20