Subtract 5/30 from 81/18
1st number: 4 9/18, 2nd number: 5/30
81/18 - 5/30 is 13/3.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 30 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 18 × 5 = 90,
81/18 = 81 × 5/18 × 5 = 405/90 - Likewise, for the 2nd fraction, since 30 × 3 = 90,
5/30 = 5 × 3/30 × 3 = 15/90 - Subtract the two like fractions:
405/90 - 15/90 = 405 - 15/90 = 390/90 - After reducing the fraction, the answer is 13/3
- In mixed form: 41/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/18-10/30 81/36-5/30 81/18-5/60 81/18-15/30 81/54-5/30 81/18-5/90 81/18-25/30 81/90-5/30 81/18-35/30