Subtract 9/5 from 81/20
1st number: 4 1/20, 2nd number: 1 4/5
81/20 - 9/5 is 9/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 5 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 20 × 1 = 20,
81/20 = 81 × 1/20 × 1 = 81/20 - Likewise, for the 2nd fraction, since 5 × 4 = 20,
9/5 = 9 × 4/5 × 4 = 36/20 - Subtract the two like fractions:
81/20 - 36/20 = 81 - 36/20 = 45/20 - After reducing the fraction, the answer is 9/4
- In mixed form: 21/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/20-18/5 81/40-9/5 81/20-9/10 81/20-27/5 81/60-9/5 81/20-9/15 81/20-45/5 81/20-9/25 81/20-63/5 81/20-9/35