Subtract 90/12 from 27/18
1st number: 1 9/18, 2nd number: 7 6/12
27/18 - 90/12 is -6/1.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 12 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 18 × 2 = 36,
27/18 = 27 × 2/18 × 2 = 54/36 - Likewise, for the 2nd fraction, since 12 × 3 = 36,
90/12 = 90 × 3/12 × 3 = 270/36 - Subtract the two like fractions:
54/36 - 270/36 = 54 - 270/36 = -216/36 - After reducing the fraction, the answer is -6/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/18-90/12 27/36-90/12 27/18-90/24 81/18-90/12 27/54-90/12 27/18-90/36 27/90-90/12 27/18-90/60 27/18-90/84