Subtract 63/21 from 63/12
1st number: 5 3/12, 2nd number: 3 0/21
63/12 - 63/21 is 9/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
63/12 = 63 × 7/12 × 7 = 441/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
63/21 = 63 × 4/21 × 4 = 252/84 - Subtract the two like fractions:
441/84 - 252/84 = 441 - 252/84 = 189/84 - After reducing the fraction, the answer is 9/4
- In mixed form: 21/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/24-63/21 63/12-63/42 63/36-63/21 63/60-63/21 63/84-63/21