Subtract 3/90 from 18/12
1st number: 1 6/12, 2nd number: 3/90
18/12 - 3/90 is 22/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 12 × 15 = 180,
18/12 = 18 × 15/12 × 15 = 270/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
3/90 = 3 × 2/90 × 2 = 6/180 - Subtract the two like fractions:
270/180 - 6/180 = 270 - 6/180 = 264/180 - After reducing the fraction, the answer is 22/15
- In mixed form: 17/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/12-3/90 18/12-6/90 18/24-3/90 54/12-3/90 18/12-9/90 18/36-3/90 90/12-3/90 18/12-15/90 18/60-3/90 18/12-21/90 18/84-3/90