Subtract 3/12 from 70/21
1st number: 3 7/21, 2nd number: 3/12
70/21 - 3/12 is 37/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 12 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
70/21 = 70 × 4/21 × 4 = 280/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
3/12 = 3 × 7/12 × 7 = 21/84 - Subtract the two like fractions:
280/84 - 21/84 = 280 - 21/84 = 259/84 - After reducing the fraction, the answer is 37/12
- In mixed form: 31/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/21-6/12 70/42-3/12 70/21-3/24 70/21-9/12 70/63-3/12 70/21-3/36 70/21-15/12 70/21-3/60 70/21-21/12 70/21-3/84