Subtract 30/81 from 28/12
1st number: 2 4/12, 2nd number: 30/81
28/12 - 30/81 is 53/27.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 81 is 324
Next, find the equivalent fraction of both fractional numbers with denominator 324 - For the 1st fraction, since 12 × 27 = 324,
28/12 = 28 × 27/12 × 27 = 756/324 - Likewise, for the 2nd fraction, since 81 × 4 = 324,
30/81 = 30 × 4/81 × 4 = 120/324 - Subtract the two like fractions:
756/324 - 120/324 = 756 - 120/324 = 636/324 - After reducing the fraction, the answer is 53/27
- In mixed form: 126/27
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/12-30/81 28/12-60/81 28/24-30/81 84/12-30/81 28/12-90/81 28/36-30/81 28/60-30/81 28/84-30/81