Subtract 10/20 from 20/81
20/81 - 10/20 is -41/162.
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,
20/81 = 20 × 20/81 × 20 = 400/1620 - Likewise, for the 2nd fraction, since 20 × 81 = 1620,
10/20 = 10 × 81/20 × 81 = 810/1620 - Subtract the two like fractions:
400/1620 - 810/1620 = 400 - 810/1620 = -410/1620 - After reducing the fraction, the answer is -41/162
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/81-10/20 20/81-10/40 60/81-10/20 20/81-30/20 20/81-10/60 20/81-50/20 20/81-70/20