Subtract 8/21 from 2/12
2/12 - 8/21 is -3/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
2/12 = 2 × 7/12 × 7 = 14/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
8/21 = 8 × 4/21 × 4 = 32/84 - Subtract the two like fractions:
14/84 - 32/84 = 14 - 32/84 = -18/84 - After reducing the fraction, the answer is -3/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/12-8/21 2/12-16/21 2/24-8/21 2/12-8/42 6/12-8/21 2/12-24/21 2/36-8/21 2/12-8/63 10/12-8/21 2/12-40/21 2/60-8/21 14/12-8/21 2/12-56/21 2/84-8/21