Subtract 15/25 from 1/21
1/21 - 15/25 is -58/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 25 is 525
Next, find the equivalent fraction of both fractional numbers with denominator 525 - For the 1st fraction, since 21 × 25 = 525,
1/21 = 1 × 25/21 × 25 = 25/525 - Likewise, for the 2nd fraction, since 25 × 21 = 525,
15/25 = 15 × 21/25 × 21 = 315/525 - Subtract the two like fractions:
25/525 - 315/525 = 25 - 315/525 = -290/525 - After reducing the fraction, the answer is -58/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21-15/25 1/21-30/25 1/42-15/25 1/21-15/50 3/21-15/25 1/21-45/25 1/63-15/25 1/21-15/75 5/21-15/25 1/21-75/25 7/21-15/25