Subtract 27/21 from 18/5
1st number: 3 3/5, 2nd number: 1 6/21
18/5 - 27/21 is 81/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 5 × 21 = 105,
18/5 = 18 × 21/5 × 21 = 378/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
27/21 = 27 × 5/21 × 5 = 135/105 - Subtract the two like fractions:
378/105 - 135/105 = 378 - 135/105 = 243/105 - After reducing the fraction, the answer is 81/35
- In mixed form: 211/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/5-27/21 18/5-54/21 18/10-27/21 18/5-27/42 54/5-27/21 18/5-81/21 18/15-27/21 18/5-27/63 90/5-27/21 18/25-27/21 18/35-27/21