Subtract 8/20 from 21/2
1st number: 10 1/2, 2nd number: 8/20
21/2 - 8/20 is 101/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 20 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 2 × 10 = 20,
21/2 = 21 × 10/2 × 10 = 210/20 - Likewise, for the 2nd fraction, since 20 × 1 = 20,
8/20 = 8 × 1/20 × 1 = 8/20 - Subtract the two like fractions:
210/20 - 8/20 = 210 - 8/20 = 202/20 - After reducing the fraction, the answer is 101/10
- In mixed form: 101/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/2-8/20 21/2-16/20 21/4-8/20 21/2-8/40 63/2-8/20 21/2-24/20 21/6-8/20 21/2-8/60 21/2-40/20 21/10-8/20 21/2-56/20 21/14-8/20