Subtract 20/70 from 84/21
1st number: 4 0/21, 2nd number: 20/70
84/21 - 20/70 is 26/7.
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,
84/21 = 84 × 10/21 × 10 = 840/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
20/70 = 20 × 3/70 × 3 = 60/210 - Subtract the two like fractions:
840/210 - 60/210 = 840 - 60/210 = 780/210 - After reducing the fraction, the answer is 26/7
- In mixed form: 35/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/21-40/70 84/42-20/70 84/21-60/70 84/63-20/70