Subtract 21/7 from 1/12
1st number: 1/12, 2nd number: 3 0/7
1/12 - 21/7 is -35/12.
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,
1/12 = 1 × 7/12 × 7 = 7/84 - Likewise, for the 2nd fraction, since 7 × 12 = 84,
21/7 = 21 × 12/7 × 12 = 252/84 - Subtract the two like fractions:
7/84 - 252/84 = 7 - 252/84 = -245/84 - After reducing the fraction, the answer is -35/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/12-21/7 1/12-42/7 1/24-21/7 1/12-21/14 3/12-21/7 1/12-63/7 1/36-21/7 5/12-21/7 1/60-21/7 1/12-21/35 7/12-21/7 1/84-21/7 1/12-21/49