Subtract 4/81 from 90/5
1st number: 18 0/5, 2nd number: 4/81
90/5 - 4/81 is 1454/81.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 81 is 405
Next, find the equivalent fraction of both fractional numbers with denominator 405 - For the 1st fraction, since 5 × 81 = 405,
90/5 = 90 × 81/5 × 81 = 7290/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
4/81 = 4 × 5/81 × 5 = 20/405 - Subtract the two like fractions:
7290/405 - 20/405 = 7290 - 20/405 = 7270/405 - After reducing the fraction, the answer is 1454/81
- In mixed form: 1777/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/5-8/81 90/10-4/81 90/5-12/81 90/15-4/81 90/5-20/81 90/25-4/81 90/5-28/81 90/35-4/81