Subtract 70/21 from 27/12
1st number: 2 3/12, 2nd number: 3 7/21
27/12 - 70/21 is -13/12.
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,
27/12 = 27 × 7/12 × 7 = 189/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
70/21 = 70 × 4/21 × 4 = 280/84 - Subtract the two like fractions:
189/84 - 280/84 = 189 - 280/84 = -91/84 - After reducing the fraction, the answer is -13/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/12-70/21 27/24-70/21 27/12-70/42 81/12-70/21 27/36-70/21 27/12-70/63 27/60-70/21 27/84-70/21