Subtract 21/50 from 36/81
36/81 - 21/50 is 11/450.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 50 is 4050
Next, find the equivalent fraction of both fractional numbers with denominator 4050 - For the 1st fraction, since 81 × 50 = 4050,
36/81 = 36 × 50/81 × 50 = 1800/4050 - Likewise, for the 2nd fraction, since 50 × 81 = 4050,
21/50 = 21 × 81/50 × 81 = 1701/4050 - Subtract the two like fractions:
1800/4050 - 1701/4050 = 1800 - 1701/4050 = 99/4050 - After reducing the fraction, the answer is 11/450
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/81-21/50 36/81-42/50 36/81-63/50