Subtract 9/81 from 6/20
6/20 - 9/81 is 17/90.
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,
6/20 = 6 × 81/20 × 81 = 486/1620 - Likewise, for the 2nd fraction, since 81 × 20 = 1620,
9/81 = 9 × 20/81 × 20 = 180/1620 - Subtract the two like fractions:
486/1620 - 180/1620 = 486 - 180/1620 = 306/1620 - After reducing the fraction, the answer is 17/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/20-9/81 6/20-18/81 6/40-9/81 18/20-9/81 6/20-27/81 6/60-9/81 30/20-9/81 6/20-45/81 42/20-9/81 6/20-63/81