Subtract 4/8 from 3/81
3/81 - 4/8 is -25/54.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 8 is 648
Next, find the equivalent fraction of both fractional numbers with denominator 648 - For the 1st fraction, since 81 × 8 = 648,
3/81 = 3 × 8/81 × 8 = 24/648 - Likewise, for the 2nd fraction, since 8 × 81 = 648,
4/8 = 4 × 81/8 × 81 = 324/648 - Subtract the two like fractions:
24/648 - 324/648 = 24 - 324/648 = -300/648 - After reducing the fraction, the answer is -25/54
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/81-4/8 3/81-4/16 9/81-4/8 3/81-12/8 3/81-4/24 15/81-4/8 3/81-20/8 3/81-4/40 21/81-4/8 3/81-28/8 3/81-4/56