Subtract 70/21 from 7/12
1st number: 7/12, 2nd number: 3 7/21
7/12 - 70/21 is -11/4.
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,
7/12 = 7 × 7/12 × 7 = 49/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
70/21 = 70 × 4/21 × 4 = 280/84 - Subtract the two like fractions:
49/84 - 280/84 = 49 - 280/84 = -231/84 - After reducing the fraction, the answer is -11/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/12-70/21 7/24-70/21 7/12-70/42 21/12-70/21 7/36-70/21 7/12-70/63 35/12-70/21 7/60-70/21 49/12-70/21 7/84-70/21