Subtract 40/18 from 18/90
1st number: 18/90, 2nd number: 2 4/18
18/90 - 40/18 is -91/45.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 90 × 1 = 90,
18/90 = 18 × 1/90 × 1 = 18/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
40/18 = 40 × 5/18 × 5 = 200/90 - Subtract the two like fractions:
18/90 - 200/90 = 18 - 200/90 = -182/90 - After reducing the fraction, the answer is -91/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/90-40/18 18/90-80/18 18/90-40/36 54/90-40/18 18/90-40/54 18/90-40/90