Subtract 20/45 from 9/36
9/36 - 20/45 is -7/36.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 45 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 36 × 5 = 180,
9/36 = 9 × 5/36 × 5 = 45/180 - Likewise, for the 2nd fraction, since 45 × 4 = 180,
20/45 = 20 × 4/45 × 4 = 80/180 - Subtract the two like fractions:
45/180 - 80/180 = 45 - 80/180 = -35/180 - After reducing the fraction, the answer is -7/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/36-20/45 9/36-40/45 9/72-20/45 9/36-20/90 27/36-20/45 9/36-60/45 45/36-20/45 63/36-20/45