Subtract 30/3 from 81/12
1st number: 6 9/12, 2nd number: 10 0/3
81/12 - 30/3 is -13/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 3 is 12
Next, find the equivalent fraction of both fractional numbers with denominator 12 - For the 1st fraction, since 12 × 1 = 12,
81/12 = 81 × 1/12 × 1 = 81/12 - Likewise, for the 2nd fraction, since 3 × 4 = 12,
30/3 = 30 × 4/3 × 4 = 120/12 - Subtract the two like fractions:
81/12 - 120/12 = 81 - 120/12 = -39/12 - After reducing the fraction, the answer is -13/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/12-60/3 81/24-30/3 81/12-30/6 81/12-90/3 81/36-30/3 81/12-30/9 81/60-30/3 81/12-30/15 81/84-30/3 81/12-30/21