Subtract 72/27 from 18/30
1st number: 18/30, 2nd number: 2 18/27
18/30 - 72/27 is -31/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 27 is 270
Next, find the equivalent fraction of both fractional numbers with denominator 270 - For the 1st fraction, since 30 × 9 = 270,
18/30 = 18 × 9/30 × 9 = 162/270 - Likewise, for the 2nd fraction, since 27 × 10 = 270,
72/27 = 72 × 10/27 × 10 = 720/270 - Subtract the two like fractions:
162/270 - 720/270 = 162 - 720/270 = -558/270 - After reducing the fraction, the answer is -31/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/30-72/27 18/60-72/27 18/30-72/54 54/30-72/27 18/90-72/27 18/30-72/81 90/30-72/27