Subtract 40/50 from 20/21
20/21 - 40/50 is 16/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 50 is 1050
Next, find the equivalent fraction of both fractional numbers with denominator 1050 - For the 1st fraction, since 21 × 50 = 1050,
20/21 = 20 × 50/21 × 50 = 1000/1050 - Likewise, for the 2nd fraction, since 50 × 21 = 1050,
40/50 = 40 × 21/50 × 21 = 840/1050 - Subtract the two like fractions:
1000/1050 - 840/1050 = 1000 - 840/1050 = 160/1050 - After reducing the fraction, the answer is 16/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/21-40/50 20/21-80/50 20/42-40/50 60/21-40/50 20/63-40/50