Subtract 8/21 from 90/28
1st number: 3 6/28, 2nd number: 8/21
90/28 - 8/21 is 17/6.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 28 × 3 = 84,
90/28 = 90 × 3/28 × 3 = 270/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
8/21 = 8 × 4/21 × 4 = 32/84 - Subtract the two like fractions:
270/84 - 32/84 = 270 - 32/84 = 238/84 - After reducing the fraction, the answer is 17/6
- In mixed form: 25/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/28-16/21 90/56-8/21 90/28-8/42 90/28-24/21 90/84-8/21 90/28-8/63 90/28-40/21 90/28-56/21