Subtract 70/21 from 7/14
1st number: 7/14, 2nd number: 3 7/21
7/14 - 70/21 is -17/6.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 14 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 14 × 3 = 42,
7/14 = 7 × 3/14 × 3 = 21/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
70/21 = 70 × 2/21 × 2 = 140/42 - Subtract the two like fractions:
21/42 - 140/42 = 21 - 140/42 = -119/42 - After reducing the fraction, the answer is -17/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 7/28-70/21 7/14-70/42 21/14-70/21 7/42-70/21 7/14-70/63 35/14-70/21 7/70-70/21 49/14-70/21 7/98-70/21