Subtract 27/45 from 21/50
21/50 - 27/45 is -9/50.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 50 and 45 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 45 × 10 = 450,
27/45 = 27 × 10/45 × 10 = 270/450 - Subtract the two like fractions:
189/450 - 270/450 = 189 - 270/450 = -81/450 - After reducing the fraction, the answer is -9/50
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/50-27/45 21/50-54/45 21/50-27/90 63/50-27/45 21/50-81/45