Subtract 1/7 from 27/21
1st number: 1 6/21, 2nd number: 1/7
27/21 - 1/7 is 8/7.
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,
1/7 = 1 × 3/7 × 3 = 3/21 - Subtract the two like fractions:
27/21 - 3/21 = 27 - 3/21 = 24/21 - After reducing the fraction, the answer is 8/7
- In mixed form: 11/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/21-1/7 27/21-2/7 27/42-1/7 27/21-1/14 81/21-1/7 27/21-3/7 27/63-1/7 27/21-1/21 27/21-5/7 27/21-1/35 27/21-1/49