Subtract 25/20 from 6/21
1st number: 6/21, 2nd number: 1 5/20
6/21 - 25/20 is -27/28.
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,
6/21 = 6 × 20/21 × 20 = 120/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
25/20 = 25 × 21/20 × 21 = 525/420 - Subtract the two like fractions:
120/420 - 525/420 = 120 - 525/420 = -405/420 - After reducing the fraction, the answer is -27/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/21-25/20 6/21-50/20 6/42-25/20 6/21-25/40 18/21-25/20 6/21-75/20 6/63-25/20 6/21-25/60 30/21-25/20 42/21-25/20