Subtract 81/12 from 10/42
1st number: 10/42, 2nd number: 6 9/12
10/42 - 81/12 is -547/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 12 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 42 × 2 = 84,
10/42 = 10 × 2/42 × 2 = 20/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
81/12 = 81 × 7/12 × 7 = 567/84 - Subtract the two like fractions:
20/84 - 567/84 = 20 - 567/84 = -547/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/42-81/12 10/84-81/12 10/42-81/24 30/42-81/12 10/42-81/36 50/42-81/12 10/42-81/60 70/42-81/12 10/42-81/84