Subtract 40/18 from 20/5
1st number: 4 0/5, 2nd number: 2 4/18
20/5 - 40/18 is 16/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 5 × 18 = 90,
20/5 = 20 × 18/5 × 18 = 360/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
40/18 = 40 × 5/18 × 5 = 200/90 - Subtract the two like fractions:
360/90 - 200/90 = 360 - 200/90 = 160/90 - After reducing the fraction, the answer is 16/9
- In mixed form: 17/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/5-40/18 20/5-80/18 20/10-40/18 20/5-40/36 60/5-40/18 20/15-40/18 20/5-40/54 20/25-40/18 20/5-40/90 20/35-40/18