Subtract 50/40 from 20/18
1st number: 1 2/18, 2nd number: 1 10/40
20/18 - 50/40 is -5/36.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 40 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 18 × 20 = 360,
20/18 = 20 × 20/18 × 20 = 400/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
50/40 = 50 × 9/40 × 9 = 450/360 - Subtract the two like fractions:
400/360 - 450/360 = 400 - 450/360 = -50/360 - After reducing the fraction, the answer is -5/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/18-50/40 20/36-50/40 20/18-50/80 60/18-50/40 20/54-50/40 20/90-50/40