Subtract 5/21 from 12/63
12/63 - 5/21 is -1/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 21 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 63 × 1 = 63,
12/63 = 12 × 1/63 × 1 = 12/63 - Likewise, for the 2nd fraction, since 21 × 3 = 63,
5/21 = 5 × 3/21 × 3 = 15/63 - Subtract the two like fractions:
12/63 - 15/63 = 12 - 15/63 = -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: 24/63-5/21 12/63-10/21 12/63-5/42 36/63-5/21 12/63-15/21 12/63-5/63 60/63-5/21 12/63-25/21 84/63-5/21 12/63-35/21