Subtract 15/81 from 90/5
1st number: 18 0/5, 2nd number: 15/81
90/5 - 15/81 is 481/27.
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,
15/81 = 15 × 5/81 × 5 = 75/405 - Subtract the two like fractions:
7290/405 - 75/405 = 7290 - 75/405 = 7215/405 - After reducing the fraction, the answer is 481/27
- In mixed form: 1722/27
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/5-30/81 90/10-15/81 90/5-45/81 90/15-15/81 90/5-75/81 90/25-15/81 90/35-15/81