Subtract 20/18 from 40/90
1st number: 40/90, 2nd number: 1 2/18
40/90 - 20/18 is -2/3.
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,
40/90 = 40 × 1/90 × 1 = 40/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
20/18 = 20 × 5/18 × 5 = 100/90 - Subtract the two like fractions:
40/90 - 100/90 = 40 - 100/90 = -60/90 - After reducing the fraction, the answer is -2/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/90-20/18 40/90-40/18 40/90-20/36 40/90-60/18 40/90-20/54 40/90-20/90