Subtract 18/90 from 27/30
27/30 - 18/90 is 7/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 30 × 3 = 90,
27/30 = 27 × 3/30 × 3 = 81/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
18/90 = 18 × 1/90 × 1 = 18/90 - Subtract the two like fractions:
81/90 - 18/90 = 81 - 18/90 = 63/90 - After reducing the fraction, the answer is 7/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/30-18/90 27/30-36/90 27/60-18/90 81/30-18/90 27/30-54/90 27/90-18/90