Subtract 75/70 from 1/21
1st number: 1/21, 2nd number: 1 5/70
1/21 - 75/70 is -43/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
1/21 = 1 × 10/21 × 10 = 10/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
75/70 = 75 × 3/70 × 3 = 225/210 - Subtract the two like fractions:
10/210 - 225/210 = 10 - 225/210 = -215/210 - After reducing the fraction, the answer is -43/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21-75/70 1/42-75/70 3/21-75/70 1/63-75/70 5/21-75/70 7/21-75/70