Subtract 75/70 from 10/21
1st number: 10/21, 2nd number: 1 5/70
10/21 - 75/70 is -25/42.
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,
10/21 = 10 × 10/21 × 10 = 100/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
75/70 = 75 × 3/70 × 3 = 225/210 - Subtract the two like fractions:
100/210 - 225/210 = 100 - 225/210 = -125/210 - After reducing the fraction, the answer is -25/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/21-75/70 10/42-75/70 30/21-75/70 10/63-75/70 50/21-75/70 70/21-75/70