Subtract 81/50 from 8/20
1st number: 8/20, 2nd number: 1 31/50
8/20 - 81/50 is -61/50.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 50 is 100
Next, find the equivalent fraction of both fractional numbers with denominator 100 - For the 1st fraction, since 20 × 5 = 100,
8/20 = 8 × 5/20 × 5 = 40/100 - Likewise, for the 2nd fraction, since 50 × 2 = 100,
81/50 = 81 × 2/50 × 2 = 162/100 - Subtract the two like fractions:
40/100 - 162/100 = 40 - 162/100 = -122/100 - After reducing the fraction, the answer is -61/50
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/20-81/50 8/40-81/50 24/20-81/50 8/60-81/50 40/20-81/50 56/20-81/50