Subtract 21/5 from 25/21
1st number: 1 4/21, 2nd number: 4 1/5
25/21 - 21/5 is -316/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 5 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 21 × 5 = 105,
25/21 = 25 × 5/21 × 5 = 125/105 - Likewise, for the 2nd fraction, since 5 × 21 = 105,
21/5 = 21 × 21/5 × 21 = 441/105 - Subtract the two like fractions:
125/105 - 441/105 = 125 - 441/105 = -316/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/21-21/5 25/21-42/5 25/42-21/5 25/21-21/10 75/21-21/5 25/21-63/5 25/63-21/5 25/21-21/15 25/21-21/25 25/21-21/35