Subtract 81/12 from 20/84
1st number: 20/84, 2nd number: 6 9/12
20/84 - 81/12 is -547/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 12 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 84 × 1 = 84,
20/84 = 20 × 1/84 × 1 = 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: 40/84-81/12 20/84-81/24 60/84-81/12 20/84-81/36 20/84-81/60 20/84-81/84