Subtract 90/18 from 30/4
1st number: 7 2/4, 2nd number: 5 0/18
30/4 - 90/18 is 5/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 18 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 4 × 9 = 36,
30/4 = 30 × 9/4 × 9 = 270/36 - Likewise, for the 2nd fraction, since 18 × 2 = 36,
90/18 = 90 × 2/18 × 2 = 180/36 - Subtract the two like fractions:
270/36 - 180/36 = 270 - 180/36 = 90/36 - After reducing the fraction, the answer is 5/2
- In mixed form: 21/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/4-90/18 30/8-90/18 30/4-90/36 90/4-90/18 30/12-90/18 30/4-90/54 30/20-90/18 30/28-90/18