Subtract 10/21 from 8/12
8/12 - 10/21 is 4/21.
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,
8/12 = 8 × 7/12 × 7 = 56/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
10/21 = 10 × 4/21 × 4 = 40/84 - Subtract the two like fractions:
56/84 - 40/84 = 56 - 40/84 = 16/84 - After reducing the fraction, the answer is 4/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/12-10/21 8/12-20/21 8/24-10/21 8/12-10/42 24/12-10/21 8/12-30/21 8/36-10/21 8/12-10/63 40/12-10/21 8/12-50/21 8/60-10/21 56/12-10/21 8/12-70/21 8/84-10/21