Subtract 12/63 from 3/21
3/21 - 12/63 is -1/21.
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,
3/21 = 3 × 3/21 × 3 = 9/63 - Likewise, for the 2nd fraction, since 63 × 1 = 63,
12/63 = 12 × 1/63 × 1 = 12/63 - Subtract the two like fractions:
9/63 - 12/63 = 9 - 12/63 = -3/63 - After reducing the fraction, the answer is -1/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/21-12/63 3/21-24/63 3/42-12/63 9/21-12/63 3/21-36/63 3/63-12/63 15/21-12/63 3/21-60/63 3/21-84/63