Subtract 6/7 from 81/42
1st number: 1 39/42, 2nd number: 6/7
81/42 - 6/7 is 15/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 7 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 42 × 1 = 42,
81/42 = 81 × 1/42 × 1 = 81/42 - Likewise, for the 2nd fraction, since 7 × 6 = 42,
6/7 = 6 × 6/7 × 6 = 36/42 - Subtract the two like fractions:
81/42 - 36/42 = 81 - 36/42 = 45/42 - After reducing the fraction, the answer is 15/14
- In mixed form: 11/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/42-12/7 81/84-6/7 81/42-6/14 81/42-18/7 81/42-6/21 81/42-30/7 81/42-6/35 81/42-42/7 81/42-6/49