Subtract 40/36 from 20/80
1st number: 20/80, 2nd number: 1 4/36
20/80 - 40/36 is -31/36.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 36 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 80 × 9 = 720,
20/80 = 20 × 9/80 × 9 = 180/720 - Likewise, for the 2nd fraction, since 36 × 20 = 720,
40/36 = 40 × 20/36 × 20 = 800/720 - Subtract the two like fractions:
180/720 - 800/720 = 180 - 800/720 = -620/720 - After reducing the fraction, the answer is -31/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/80-40/36 20/80-80/36 20/80-40/72 60/80-40/36