Subtract 5/7 from 27/21
1st number: 1 6/21, 2nd number: 5/7
27/21 - 5/7 is 4/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 7 is 21
Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 21 × 1 = 21,
27/21 = 27 × 1/21 × 1 = 27/21 - Likewise, for the 2nd fraction, since 7 × 3 = 21,
5/7 = 5 × 3/7 × 3 = 15/21 - Subtract the two like fractions:
27/21 - 15/21 = 27 - 15/21 = 12/21 - After reducing the fraction, the answer is 4/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/21-5/7 27/21-10/7 27/42-5/7 27/21-5/14 81/21-5/7 27/21-15/7 27/63-5/7 27/21-5/21 27/21-25/7 27/21-5/35 27/21-35/7 27/21-5/49