Subtract 54/7 from 8/21
1st number: 8/21, 2nd number: 7 5/7
8/21 - 54/7 is -22/3.
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,
8/21 = 8 × 1/21 × 1 = 8/21 - Likewise, for the 2nd fraction, since 7 × 3 = 21,
54/7 = 54 × 3/7 × 3 = 162/21 - Subtract the two like fractions:
8/21 - 162/21 = 8 - 162/21 = -154/21 - After reducing the fraction, the answer is -22/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/21-54/7 8/42-54/7 8/21-54/14 24/21-54/7 8/63-54/7 8/21-54/21 40/21-54/7 8/21-54/35 56/21-54/7 8/21-54/49