Subtract 8/21 from 90/3
1st number: 30 0/3, 2nd number: 8/21
90/3 - 8/21 is 622/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 21 is 21
Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 3 × 7 = 21,
90/3 = 90 × 7/3 × 7 = 630/21 - Likewise, for the 2nd fraction, since 21 × 1 = 21,
8/21 = 8 × 1/21 × 1 = 8/21 - Subtract the two like fractions:
630/21 - 8/21 = 630 - 8/21 = 622/21 - In mixed form: 2913/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/3-16/21 90/6-8/21 90/3-8/42 90/3-24/21 90/9-8/21 90/3-8/63 90/3-40/21 90/15-8/21 90/3-56/21 90/21-8/21