Subtract 56/81 from 45/12
1st number: 3 9/12, 2nd number: 56/81
45/12 - 56/81 is 991/324.
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,
45/12 = 45 × 27/12 × 27 = 1215/324 - Likewise, for the 2nd fraction, since 81 × 4 = 324,
56/81 = 56 × 4/81 × 4 = 224/324 - Subtract the two like fractions:
1215/324 - 224/324 = 1215 - 224/324 = 991/324 - In mixed form: 319/324
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/12-56/81 45/24-56/81 45/36-56/81 45/60-56/81 45/84-56/81