Subtract 63/54 from 3/21
1st number: 3/21, 2nd number: 1 9/54
3/21 - 63/54 is -43/42.
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,
3/21 = 3 × 18/21 × 18 = 54/378 - Likewise, for the 2nd fraction, since 54 × 7 = 378,
63/54 = 63 × 7/54 × 7 = 441/378 - Subtract the two like fractions:
54/378 - 441/378 = 54 - 441/378 = -387/378 - After reducing the fraction, the answer is -43/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/21-63/54 3/42-63/54 9/21-63/54 3/63-63/54 15/21-63/54