Subtract 20/4 from 81/10
1st number: 8 1/10, 2nd number: 5 0/4
81/10 - 20/4 is 31/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 4 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 10 × 2 = 20,
81/10 = 81 × 2/10 × 2 = 162/20 - Likewise, for the 2nd fraction, since 4 × 5 = 20,
20/4 = 20 × 5/4 × 5 = 100/20 - Subtract the two like fractions:
162/20 - 100/20 = 162 - 100/20 = 62/20 - After reducing the fraction, the answer is 31/10
- In mixed form: 31/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/10-40/4 81/20-20/4 81/10-20/8 81/10-60/4 81/30-20/4 81/10-20/12 81/50-20/4 81/70-20/4 81/10-20/28