Subtract 8/40 from 16/81
16/81 - 8/40 is -1/405.
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,
16/81 = 16 × 40/81 × 40 = 640/3240 - Likewise, for the 2nd fraction, since 40 × 81 = 3240,
8/40 = 8 × 81/40 × 81 = 648/3240 - Subtract the two like fractions:
640/3240 - 648/3240 = 640 - 648/3240 = -8/3240 - After reducing the fraction, the answer is -1/405
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 32/81-8/40 16/81-16/40 16/81-8/80 48/81-8/40 16/81-24/40 80/81-8/40 16/81-56/40