Subtract 8/21 from 90/75
1st number: 1 15/75, 2nd number: 8/21
90/75 - 8/21 is 86/105.
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,
90/75 = 90 × 7/75 × 7 = 630/525 - Likewise, for the 2nd fraction, since 21 × 25 = 525,
8/21 = 8 × 25/21 × 25 = 200/525 - Subtract the two like fractions:
630/525 - 200/525 = 630 - 200/525 = 430/525 - After reducing the fraction, the answer is 86/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/75-16/21 90/75-8/42 90/75-24/21 90/75-8/63 90/75-40/21 90/75-56/21