Subtract 27/18 from 21/5
1st number: 4 1/5, 2nd number: 1 9/18
21/5 - 27/18 is 27/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 5 × 18 = 90,
21/5 = 21 × 18/5 × 18 = 378/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
27/18 = 27 × 5/18 × 5 = 135/90 - Subtract the two like fractions:
378/90 - 135/90 = 378 - 135/90 = 243/90 - After reducing the fraction, the answer is 27/10
- In mixed form: 27/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/5-27/18 21/5-54/18 21/10-27/18 21/5-27/36 63/5-27/18 21/5-81/18 21/15-27/18 21/5-27/54 21/25-27/18 21/5-27/90 21/35-27/18