Subtract 5/20 from 40/21
1st number: 1 19/21, 2nd number: 5/20
40/21 - 5/20 is 139/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 21 × 20 = 420,
40/21 = 40 × 20/21 × 20 = 800/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
5/20 = 5 × 21/20 × 21 = 105/420 - Subtract the two like fractions:
800/420 - 105/420 = 800 - 105/420 = 695/420 - After reducing the fraction, the answer is 139/84
- In mixed form: 155/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/21-5/20 40/21-10/20 40/42-5/20 40/21-5/40 40/21-15/20 40/63-5/20 40/21-5/60 40/21-25/20 40/21-35/20