Subtract 81/21 from 36/50
1st number: 36/50, 2nd number: 3 18/21
36/50 - 81/21 is -549/175.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 50 and 21 is 1050
Next, find the equivalent fraction of both fractional numbers with denominator 1050 - For the 1st fraction, since 50 × 21 = 1050,
36/50 = 36 × 21/50 × 21 = 756/1050 - Likewise, for the 2nd fraction, since 21 × 50 = 1050,
81/21 = 81 × 50/21 × 50 = 4050/1050 - Subtract the two like fractions:
756/1050 - 4050/1050 = 756 - 4050/1050 = -3294/1050 - After reducing the fraction, the answer is -549/175
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/50-81/21 36/50-81/42 36/50-81/63