Subtract 8/20 from 6/81
6/81 - 8/20 is -44/135.
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,
6/81 = 6 × 20/81 × 20 = 120/1620 - Likewise, for the 2nd fraction, since 20 × 81 = 1620,
8/20 = 8 × 81/20 × 81 = 648/1620 - Subtract the two like fractions:
120/1620 - 648/1620 = 120 - 648/1620 = -528/1620 - After reducing the fraction, the answer is -44/135
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/81-8/20 6/81-16/20 6/81-8/40 18/81-8/20 6/81-24/20 6/81-8/60 30/81-8/20 6/81-40/20 42/81-8/20 6/81-56/20