Subtract 5/12 from 90/21
1st number: 4 6/21, 2nd number: 5/12
90/21 - 5/12 is 325/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 12 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
90/21 = 90 × 4/21 × 4 = 360/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
5/12 = 5 × 7/12 × 7 = 35/84 - Subtract the two like fractions:
360/84 - 35/84 = 360 - 35/84 = 325/84 - In mixed form: 373/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/21-10/12 90/42-5/12 90/21-5/24 90/21-15/12 90/63-5/12 90/21-5/36 90/21-25/12 90/21-5/60 90/21-35/12 90/21-5/84