Subtract 3/27 from 21/12
1st number: 1 9/12, 2nd number: 3/27
21/12 - 3/27 is 59/36.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 27 is 108
Next, find the equivalent fraction of both fractional numbers with denominator 108 - For the 1st fraction, since 12 × 9 = 108,
21/12 = 21 × 9/12 × 9 = 189/108 - Likewise, for the 2nd fraction, since 27 × 4 = 108,
3/27 = 3 × 4/27 × 4 = 12/108 - Subtract the two like fractions:
189/108 - 12/108 = 189 - 12/108 = 177/108 - After reducing the fraction, the answer is 59/36
- In mixed form: 123/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/12-3/27 21/12-6/27 21/24-3/27 21/12-3/54 63/12-3/27 21/12-9/27 21/36-3/27 21/12-3/81 21/12-15/27 21/60-3/27 21/12-21/27 21/84-3/27