Subtract 9/21 from 10/75
10/75 - 9/21 is -31/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 75 and 21 is 525
Next, find the equivalent fraction of both fractional numbers with denominator 525 - For the 1st fraction, since 75 × 7 = 525,
10/75 = 10 × 7/75 × 7 = 70/525 - Likewise, for the 2nd fraction, since 21 × 25 = 525,
9/21 = 9 × 25/21 × 25 = 225/525 - Subtract the two like fractions:
70/525 - 225/525 = 70 - 225/525 = -155/525 - After reducing the fraction, the answer is -31/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/75-9/21 10/75-18/21 10/75-9/42 30/75-9/21 10/75-27/21 10/75-9/63 50/75-9/21 10/75-45/21 70/75-9/21 10/75-63/21