Subtract 45/30 from 81/12
1st number: 6 9/12, 2nd number: 1 15/30
81/12 - 45/30 is 21/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 30 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 12 × 5 = 60,
81/12 = 81 × 5/12 × 5 = 405/60 - Likewise, for the 2nd fraction, since 30 × 2 = 60,
45/30 = 45 × 2/30 × 2 = 90/60 - Subtract the two like fractions:
405/60 - 90/60 = 405 - 90/60 = 315/60 - After reducing the fraction, the answer is 21/4
- In mixed form: 51/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/12-90/30 81/24-45/30 81/12-45/60 81/36-45/30 81/12-45/90 81/60-45/30 81/84-45/30