Subtract 40/50 from 15/18
15/18 - 40/50 is 1/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 50 is 450
Next, find the equivalent fraction of both fractional numbers with denominator 450 - For the 1st fraction, since 18 × 25 = 450,
15/18 = 15 × 25/18 × 25 = 375/450 - Likewise, for the 2nd fraction, since 50 × 9 = 450,
40/50 = 40 × 9/50 × 9 = 360/450 - Subtract the two like fractions:
375/450 - 360/450 = 375 - 360/450 = 15/450 - After reducing the fraction, the answer is 1/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/18-40/50 15/18-80/50 15/36-40/50 45/18-40/50 15/54-40/50 75/18-40/50 15/90-40/50