Subtract 25/90 from 21/50
21/50 - 25/90 is 32/225.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 50 and 90 is 450
Next, find the equivalent fraction of both fractional numbers with denominator 450 - For the 1st fraction, since 50 × 9 = 450,
21/50 = 21 × 9/50 × 9 = 189/450 - Likewise, for the 2nd fraction, since 90 × 5 = 450,
25/90 = 25 × 5/90 × 5 = 125/450 - Subtract the two like fractions:
189/450 - 125/450 = 189 - 125/450 = 64/450 - After reducing the fraction, the answer is 32/225
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/50-25/90 21/50-50/90 63/50-25/90 21/50-75/90