Subtract 1/90 from 30/18
1st number: 1 12/18, 2nd number: 1/90
30/18 - 1/90 is 149/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 18 × 5 = 90,
30/18 = 30 × 5/18 × 5 = 150/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
1/90 = 1 × 1/90 × 1 = 1/90 - Subtract the two like fractions:
150/90 - 1/90 = 150 - 1/90 = 149/90 - In mixed form: 159/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/18-1/90 30/18-2/90 30/36-1/90 90/18-1/90 30/18-3/90 30/54-1/90 30/18-5/90 30/90-1/90 30/18-7/90