Subtract 18/7 from 81/24
1st number: 3 9/24, 2nd number: 2 4/7
81/24 - 18/7 is 45/56.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 7 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 24 × 7 = 168,
81/24 = 81 × 7/24 × 7 = 567/168 - Likewise, for the 2nd fraction, since 7 × 24 = 168,
18/7 = 18 × 24/7 × 24 = 432/168 - Subtract the two like fractions:
567/168 - 432/168 = 567 - 432/168 = 135/168 - After reducing the fraction, the answer is 45/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/24-36/7 81/48-18/7 81/24-18/14 81/24-54/7 81/72-18/7 81/24-18/21 81/24-90/7 81/24-18/35 81/24-18/49