Subtract 81/18 from 4/8
1st number: 4/8, 2nd number: 4 9/18
4/8 - 81/18 is -4/1.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 18 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 8 × 9 = 72,
4/8 = 4 × 9/8 × 9 = 36/72 - Likewise, for the 2nd fraction, since 18 × 4 = 72,
81/18 = 81 × 4/18 × 4 = 324/72 - Subtract the two like fractions:
36/72 - 324/72 = 36 - 324/72 = -288/72 - After reducing the fraction, the answer is -4/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/16-81/18 4/8-81/36 12/8-81/18 4/24-81/18 4/8-81/54 20/8-81/18 4/40-81/18 4/8-81/90 28/8-81/18 4/56-81/18