Subtract 8/54 from 5/21
5/21 - 8/54 is 17/189.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 54 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 21 × 18 = 378,
5/21 = 5 × 18/21 × 18 = 90/378 - Likewise, for the 2nd fraction, since 54 × 7 = 378,
8/54 = 8 × 7/54 × 7 = 56/378 - Subtract the two like fractions:
90/378 - 56/378 = 90 - 56/378 = 34/378 - After reducing the fraction, the answer is 17/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/21-8/54 5/21-16/54 5/42-8/54 15/21-8/54 5/21-24/54 5/63-8/54 25/21-8/54 5/21-40/54 35/21-8/54 5/21-56/54