Subtract 15/21 from 5/25
5/25 - 15/21 is -18/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 25 and 21 is 525
Next, find the equivalent fraction of both fractional numbers with denominator 525 - For the 1st fraction, since 25 × 21 = 525,
5/25 = 5 × 21/25 × 21 = 105/525 - Likewise, for the 2nd fraction, since 21 × 25 = 525,
15/21 = 15 × 25/21 × 25 = 375/525 - Subtract the two like fractions:
105/525 - 375/525 = 105 - 375/525 = -270/525 - After reducing the fraction, the answer is -18/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/25-15/21 5/25-30/21 5/50-15/21 5/25-15/42 15/25-15/21 5/25-45/21 5/75-15/21 5/25-15/63 5/25-75/21 35/25-15/21