Subtract 8/10 from 84/21
1st number: 4 0/21, 2nd number: 8/10
84/21 - 8/10 is 16/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 10 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 10 × 21 = 210,
8/10 = 8 × 21/10 × 21 = 168/210 - Subtract the two like fractions:
840/210 - 168/210 = 840 - 168/210 = 672/210 - After reducing the fraction, the answer is 16/5
- In mixed form: 31/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/21-16/10 84/42-8/10 84/21-8/20 84/21-24/10 84/63-8/10 84/21-8/30 84/21-40/10 84/21-8/50 84/21-56/10 84/21-8/70