Subtract 90/20 from 15/4
1st number: 3 3/4, 2nd number: 4 10/20
15/4 - 90/20 is -3/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 20 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 4 × 5 = 20,
15/4 = 15 × 5/4 × 5 = 75/20 - Likewise, for the 2nd fraction, since 20 × 1 = 20,
90/20 = 90 × 1/20 × 1 = 90/20 - Subtract the two like fractions:
75/20 - 90/20 = 75 - 90/20 = -15/20 - After reducing the fraction, the answer is -3/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/4-90/20 15/8-90/20 15/4-90/40 45/4-90/20 15/12-90/20 15/4-90/60 75/4-90/20 15/20-90/20 15/28-90/20