Subtract 12/81 from 10/20
10/20 - 12/81 is 19/54.
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,
12/81 = 12 × 20/81 × 20 = 240/1620 - Subtract the two like fractions:
810/1620 - 240/1620 = 810 - 240/1620 = 570/1620 - After reducing the fraction, the answer is 19/54
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/20-24/81 10/40-12/81 30/20-12/81 10/20-36/81 10/60-12/81 50/20-12/81 10/20-60/81 70/20-12/81 10/20-84/81