Subtract 6/7 from 54/21
1st number: 2 12/21, 2nd number: 6/7
54/21 - 6/7 is 12/7.
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,
54/21 = 54 × 1/21 × 1 = 54/21 - Likewise, for the 2nd fraction, since 7 × 3 = 21,
6/7 = 6 × 3/7 × 3 = 18/21 - Subtract the two like fractions:
54/21 - 18/21 = 54 - 18/21 = 36/21 - After reducing the fraction, the answer is 12/7
- In mixed form: 15/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/21-12/7 54/42-6/7 54/21-6/14 54/21-18/7 54/63-6/7 54/21-6/21 54/21-30/7 54/21-6/35 54/21-42/7 54/21-6/49