Subtract 70/21 from 7/70
1st number: 7/70, 2nd number: 3 7/21
7/70 - 70/21 is -97/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 70 × 3 = 210,
7/70 = 7 × 3/70 × 3 = 21/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
70/21 = 70 × 10/21 × 10 = 700/210 - Subtract the two like fractions:
21/210 - 700/210 = 21 - 700/210 = -679/210 - After reducing the fraction, the answer is -97/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/70-70/21 7/70-70/42 21/70-70/21 7/70-70/63 35/70-70/21 49/70-70/21