Subtract 81/18 from 2/8
1st number: 2/8, 2nd number: 4 9/18
2/8 - 81/18 is -17/4.
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,
2/8 = 2 × 9/8 × 9 = 18/72 - Likewise, for the 2nd fraction, since 18 × 4 = 72,
81/18 = 81 × 4/18 × 4 = 324/72 - Subtract the two like fractions:
18/72 - 324/72 = 18 - 324/72 = -306/72 - After reducing the fraction, the answer is -17/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/8-81/18 2/16-81/18 2/8-81/36 6/8-81/18 2/24-81/18 2/8-81/54 10/8-81/18 2/40-81/18 2/8-81/90 14/8-81/18 2/56-81/18