Subtract 25/20 from 4/21
1st number: 4/21, 2nd number: 1 5/20
4/21 - 25/20 is -89/84.
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,
4/21 = 4 × 20/21 × 20 = 80/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
25/20 = 25 × 21/20 × 21 = 525/420 - Subtract the two like fractions:
80/420 - 525/420 = 80 - 525/420 = -445/420 - After reducing the fraction, the answer is -89/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/21-25/20 4/21-50/20 4/42-25/20 4/21-25/40 12/21-25/20 4/21-75/20 4/63-25/20 4/21-25/60 20/21-25/20 28/21-25/20