Subtract 3/20 from 90/75
1st number: 1 15/75, 2nd number: 3/20
90/75 - 3/20 is 21/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 75 and 20 is 300
Next, find the equivalent fraction of both fractional numbers with denominator 300 - For the 1st fraction, since 75 × 4 = 300,
90/75 = 90 × 4/75 × 4 = 360/300 - Likewise, for the 2nd fraction, since 20 × 15 = 300,
3/20 = 3 × 15/20 × 15 = 45/300 - Subtract the two like fractions:
360/300 - 45/300 = 360 - 45/300 = 315/300 - After reducing the fraction, the answer is 21/20
- In mixed form: 11/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/75-6/20 90/75-3/40 90/75-9/20 90/75-3/60 90/75-15/20 90/75-21/20