Subtract 18/4 from 90/3
1st number: 30 0/3, 2nd number: 4 2/4
90/3 - 18/4 is 51/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 4 is 12
Next, find the equivalent fraction of both fractional numbers with denominator 12 - For the 1st fraction, since 3 × 4 = 12,
90/3 = 90 × 4/3 × 4 = 360/12 - Likewise, for the 2nd fraction, since 4 × 3 = 12,
18/4 = 18 × 3/4 × 3 = 54/12 - Subtract the two like fractions:
360/12 - 54/12 = 360 - 54/12 = 306/12 - After reducing the fraction, the answer is 51/2
- In mixed form: 251/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/3-36/4 90/6-18/4 90/3-18/8 90/3-54/4 90/9-18/4 90/3-18/12 90/3-90/4 90/15-18/4 90/3-18/20 90/21-18/4 90/3-18/28