Subtract 45/20 from 20/90
1st number: 20/90, 2nd number: 2 5/20
20/90 - 45/20 is -73/36.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 90 × 2 = 180,
20/90 = 20 × 2/90 × 2 = 40/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
45/20 = 45 × 9/20 × 9 = 405/180 - Subtract the two like fractions:
40/180 - 405/180 = 40 - 405/180 = -365/180 - After reducing the fraction, the answer is -73/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/90-45/20 20/90-90/20 20/90-45/40 60/90-45/20 20/90-45/60