Subtract 56/75 from 15/21
15/21 - 56/75 is -17/525.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 75 is 525
Next, find the equivalent fraction of both fractional numbers with denominator 525 - For the 1st fraction, since 21 × 25 = 525,
15/21 = 15 × 25/21 × 25 = 375/525 - Likewise, for the 2nd fraction, since 75 × 7 = 525,
56/75 = 56 × 7/75 × 7 = 392/525 - Subtract the two like fractions:
375/525 - 392/525 = 375 - 392/525 = -17/525
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/21-56/75 15/42-56/75 45/21-56/75 15/63-56/75 75/21-56/75