Subtract 27/21 from 12/63
1st number: 12/63, 2nd number: 1 6/21
12/63 - 27/21 is -23/21.
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,
27/21 = 27 × 3/21 × 3 = 81/63 - Subtract the two like fractions:
12/63 - 81/63 = 12 - 81/63 = -69/63 - After reducing the fraction, the answer is -23/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/63-27/21 12/63-54/21 12/63-27/42 36/63-27/21 12/63-81/21 12/63-27/63 60/63-27/21 84/63-27/21