Subtract 21/7 from 4/12
1st number: 4/12, 2nd number: 3 0/7
4/12 - 21/7 is -8/3.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 7 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 7 × 12 = 84,
21/7 = 21 × 12/7 × 12 = 252/84 - Subtract the two like fractions:
28/84 - 252/84 = 28 - 252/84 = -224/84 - After reducing the fraction, the answer is -8/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/12-21/7 4/12-42/7 4/24-21/7 4/12-21/14 4/12-63/7 4/36-21/7 20/12-21/7 4/60-21/7 4/12-21/35 28/12-21/7 4/84-21/7 4/12-21/49