Subtract 64/63 from 21/12
1st number: 1 9/12, 2nd number: 1 1/63
21/12 - 64/63 is 185/252.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 63 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 12 × 21 = 252,
21/12 = 21 × 21/12 × 21 = 441/252 - Likewise, for the 2nd fraction, since 63 × 4 = 252,
64/63 = 64 × 4/63 × 4 = 256/252 - Subtract the two like fractions:
441/252 - 256/252 = 441 - 256/252 = 185/252
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/12-64/63 21/24-64/63 63/12-64/63 21/36-64/63 21/60-64/63 21/84-64/63