Subtract 27/21 from 63/18
1st number: 3 9/18, 2nd number: 1 6/21
63/18 - 27/21 is 31/14.
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,
63/18 = 63 × 7/18 × 7 = 441/126 - Likewise, for the 2nd fraction, since 21 × 6 = 126,
27/21 = 27 × 6/21 × 6 = 162/126 - Subtract the two like fractions:
441/126 - 162/126 = 441 - 162/126 = 279/126 - After reducing the fraction, the answer is 31/14
- In mixed form: 23/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/18-54/21 63/36-27/21 63/18-27/42 63/18-81/21 63/54-27/21 63/18-27/63 63/90-27/21