Subtract 7/21 from 4/12
4/12 - 7/21 is 0/1.
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,
4/12 = 4 × 7/12 × 7 = 28/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
7/21 = 7 × 4/21 × 4 = 28/84 - Subtract the two like fractions:
28/84 - 28/84 = 28 - 28/84 = 0/84 - The answer is 0
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/12-7/21 4/12-14/21 4/24-7/21 4/12-7/42 4/36-7/21 4/12-7/63 20/12-7/21 4/12-35/21 4/60-7/21 28/12-7/21 4/12-49/21 4/84-7/21