Subtract 3/63 from 12/21
12/21 - 3/63 is 11/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 63 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
12/21 = 12 × 3/21 × 3 = 36/63 - Likewise, for the 2nd fraction, since 63 × 1 = 63,
3/63 = 3 × 1/63 × 1 = 3/63 - Subtract the two like fractions:
36/63 - 3/63 = 36 - 3/63 = 33/63 - After reducing the fraction, the answer is 11/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/21-3/63 12/21-6/63 12/42-3/63 36/21-3/63 12/21-9/63 12/63-3/63 60/21-3/63 12/21-15/63 84/21-3/63 12/21-21/63