Subtract 2/81 from 10/20
10/20 - 2/81 is 77/162.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 81 is 1620
Next, find the equivalent fraction of both fractional numbers with denominator 1620 - For the 1st fraction, since 20 × 81 = 1620,
10/20 = 10 × 81/20 × 81 = 810/1620 - Likewise, for the 2nd fraction, since 81 × 20 = 1620,
2/81 = 2 × 20/81 × 20 = 40/1620 - Subtract the two like fractions:
810/1620 - 40/1620 = 810 - 40/1620 = 770/1620 - After reducing the fraction, the answer is 77/162
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/20-4/81 10/40-2/81 30/20-2/81 10/20-6/81 10/60-2/81 50/20-2/81 10/20-10/81 70/20-2/81 10/20-14/81