Subtract 18/81 from 45/30
1st number: 1 15/30, 2nd number: 18/81
45/30 - 18/81 is 23/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 81 is 810
Next, find the equivalent fraction of both fractional numbers with denominator 810 - For the 1st fraction, since 30 × 27 = 810,
45/30 = 45 × 27/30 × 27 = 1215/810 - Likewise, for the 2nd fraction, since 81 × 10 = 810,
18/81 = 18 × 10/81 × 10 = 180/810 - Subtract the two like fractions:
1215/810 - 180/810 = 1215 - 180/810 = 1035/810 - After reducing the fraction, the answer is 23/18
- In mixed form: 15/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/30-18/81 45/30-36/81 45/60-18/81 45/30-54/81 45/90-18/81 45/30-90/81