Subtract 70/21 from 1/12
1st number: 1/12, 2nd number: 3 7/21
1/12 - 70/21 is -13/4.
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,
1/12 = 1 × 7/12 × 7 = 7/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
70/21 = 70 × 4/21 × 4 = 280/84 - Subtract the two like fractions:
7/84 - 280/84 = 7 - 280/84 = -273/84 - After reducing the fraction, the answer is -13/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/12-70/21 1/24-70/21 1/12-70/42 3/12-70/21 1/36-70/21 1/12-70/63 5/12-70/21 1/60-70/21 7/12-70/21 1/84-70/21