Subtract 21/50 from 20/40
20/40 - 21/50 is 2/25.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 50 is 200
Next, find the equivalent fraction of both fractional numbers with denominator 200 - For the 1st fraction, since 40 × 5 = 200,
20/40 = 20 × 5/40 × 5 = 100/200 - Likewise, for the 2nd fraction, since 50 × 4 = 200,
21/50 = 21 × 4/50 × 4 = 84/200 - Subtract the two like fractions:
100/200 - 84/200 = 100 - 84/200 = 16/200 - After reducing the fraction, the answer is 2/25
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/40-42/50 20/80-21/50 60/40-21/50 20/40-63/50