Subtract 2/54 from 7/21
7/21 - 2/54 is 8/27.
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,
7/21 = 7 × 18/21 × 18 = 126/378 - Likewise, for the 2nd fraction, since 54 × 7 = 378,
2/54 = 2 × 7/54 × 7 = 14/378 - Subtract the two like fractions:
126/378 - 14/378 = 126 - 14/378 = 112/378 - After reducing the fraction, the answer is 8/27
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21-2/54 7/21-4/54 7/42-2/54 7/21-6/54 7/63-2/54 35/21-2/54 7/21-10/54 49/21-2/54 7/21-14/54