Subtract 7/42 from 81/8
1st number: 10 1/8, 2nd number: 7/42
81/8 - 7/42 is 239/24.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 42 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 8 × 21 = 168,
81/8 = 81 × 21/8 × 21 = 1701/168 - Likewise, for the 2nd fraction, since 42 × 4 = 168,
7/42 = 7 × 4/42 × 4 = 28/168 - Subtract the two like fractions:
1701/168 - 28/168 = 1701 - 28/168 = 1673/168 - After reducing the fraction, the answer is 239/24
- In mixed form: 923/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/8-14/42 81/16-7/42 81/8-7/84 81/8-21/42 81/24-7/42 81/8-35/42 81/40-7/42 81/8-49/42 81/56-7/42