Subtract 9/20 from 81/5
1st number: 16 1/5, 2nd number: 9/20
81/5 - 9/20 is 63/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 20 is 20
Next, find the equivalent fraction of both fractional numbers with denominator 20 - For the 1st fraction, since 5 × 4 = 20,
81/5 = 81 × 4/5 × 4 = 324/20 - Likewise, for the 2nd fraction, since 20 × 1 = 20,
9/20 = 9 × 1/20 × 1 = 9/20 - Subtract the two like fractions:
324/20 - 9/20 = 324 - 9/20 = 315/20 - After reducing the fraction, the answer is 63/4
- In mixed form: 153/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/5-18/20 81/10-9/20 81/5-9/40 81/5-27/20 81/15-9/20 81/5-9/60 81/5-45/20 81/25-9/20 81/5-63/20 81/35-9/20