Subtract 10/70 from 90/21
1st number: 4 6/21, 2nd number: 10/70
90/21 - 10/70 is 29/7.
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,
90/21 = 90 × 10/21 × 10 = 900/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
10/70 = 10 × 3/70 × 3 = 30/210 - Subtract the two like fractions:
900/210 - 30/210 = 900 - 30/210 = 870/210 - After reducing the fraction, the answer is 29/7
- In mixed form: 41/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/21-20/70 90/42-10/70 90/21-30/70 90/63-10/70 90/21-50/70