Subtract 1/21 from 63/54
1st number: 1 9/54, 2nd number: 1/21
63/54 - 1/21 is 47/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 54 and 21 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 54 × 7 = 378,
63/54 = 63 × 7/54 × 7 = 441/378 - Likewise, for the 2nd fraction, since 21 × 18 = 378,
1/21 = 1 × 18/21 × 18 = 18/378 - Subtract the two like fractions:
441/378 - 18/378 = 441 - 18/378 = 423/378 - After reducing the fraction, the answer is 47/42
- In mixed form: 15/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/54-2/21 63/54-1/42 63/54-3/21 63/54-1/63 63/54-5/21 63/54-7/21