Subtract 20/50 from 25/90
25/90 - 20/50 is -11/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 50 is 450
Next, find the equivalent fraction of both fractional numbers with denominator 450 - For the 1st fraction, since 90 × 5 = 450,
25/90 = 25 × 5/90 × 5 = 125/450 - Likewise, for the 2nd fraction, since 50 × 9 = 450,
20/50 = 20 × 9/50 × 9 = 180/450 - Subtract the two like fractions:
125/450 - 180/450 = 125 - 180/450 = -55/450 - After reducing the fraction, the answer is -11/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/90-20/50 25/90-40/50 75/90-20/50 25/90-60/50