Subtract 25/21 from 27/18
1st number: 1 9/18, 2nd number: 1 4/21
27/18 - 25/21 is 13/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 21 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 18 × 7 = 126,
27/18 = 27 × 7/18 × 7 = 189/126 - Likewise, for the 2nd fraction, since 21 × 6 = 126,
25/21 = 25 × 6/21 × 6 = 150/126 - Subtract the two like fractions:
189/126 - 150/126 = 189 - 150/126 = 39/126 - After reducing the fraction, the answer is 13/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/18-25/21 27/18-50/21 27/36-25/21 27/18-25/42 81/18-25/21 27/18-75/21 27/54-25/21 27/18-25/63 27/90-25/21