Subtract 27/30 from 6/18
6/18 - 27/30 is -17/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 30 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 18 × 5 = 90,
6/18 = 6 × 5/18 × 5 = 30/90 - Likewise, for the 2nd fraction, since 30 × 3 = 90,
27/30 = 27 × 3/30 × 3 = 81/90 - Subtract the two like fractions:
30/90 - 81/90 = 30 - 81/90 = -51/90 - After reducing the fraction, the answer is -17/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/18-27/30 6/18-54/30 6/36-27/30 6/18-27/60 6/18-81/30 6/54-27/30 6/18-27/90 30/18-27/30 6/90-27/30 42/18-27/30