Subtract 3/6 from 40/81
40/81 - 3/6 is -1/162.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 6 is 162
Next, find the equivalent fraction of both fractional numbers with denominator 162 - For the 1st fraction, since 81 × 2 = 162,
40/81 = 40 × 2/81 × 2 = 80/162 - Likewise, for the 2nd fraction, since 6 × 27 = 162,
3/6 = 3 × 27/6 × 27 = 81/162 - Subtract the two like fractions:
80/162 - 81/162 = 80 - 81/162 = -1/162
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/81-3/6 40/81-3/12 40/81-9/6 40/81-3/18 40/81-15/6 40/81-3/30 40/81-21/6 40/81-3/42