Subtract 50/45 from 18/81
1st number: 18/81, 2nd number: 1 5/45
18/81 - 50/45 is -8/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 45 is 405
Next, find the equivalent fraction of both fractional numbers with denominator 405 - For the 1st fraction, since 81 × 5 = 405,
18/81 = 18 × 5/81 × 5 = 90/405 - Likewise, for the 2nd fraction, since 45 × 9 = 405,
50/45 = 50 × 9/45 × 9 = 450/405 - Subtract the two like fractions:
90/405 - 450/405 = 90 - 450/405 = -360/405 - After reducing the fraction, the answer is -8/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/81-50/45 18/81-50/90 54/81-50/45 90/81-50/45