Subtract 7/42 from 81/24
1st number: 3 9/24, 2nd number: 7/42
81/24 - 7/42 is 77/24.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 42 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 42 × 4 = 168,
7/42 = 7 × 4/42 × 4 = 28/168 - Subtract the two like fractions:
567/168 - 28/168 = 567 - 28/168 = 539/168 - After reducing the fraction, the answer is 77/24
- In mixed form: 35/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/24-14/42 81/48-7/42 81/24-7/84 81/24-21/42 81/72-7/42 81/24-35/42 81/24-49/42