Subtract 8/40 from 6/81
6/81 - 8/40 is -17/135.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 40 is 3240
Next, find the equivalent fraction of both fractional numbers with denominator 3240 - For the 1st fraction, since 81 × 40 = 3240,
6/81 = 6 × 40/81 × 40 = 240/3240 - Likewise, for the 2nd fraction, since 40 × 81 = 3240,
8/40 = 8 × 81/40 × 81 = 648/3240 - Subtract the two like fractions:
240/3240 - 648/3240 = 240 - 648/3240 = -408/3240 - After reducing the fraction, the answer is -17/135
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/81-8/40 6/81-16/40 6/81-8/80 18/81-8/40 6/81-24/40 30/81-8/40 42/81-8/40 6/81-56/40