Subtract 9/21 from 45/12
1st number: 3 9/12, 2nd number: 9/21
45/12 - 9/21 is 93/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
45/12 = 45 × 7/12 × 7 = 315/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
9/21 = 9 × 4/21 × 4 = 36/84 - Subtract the two like fractions:
315/84 - 36/84 = 315 - 36/84 = 279/84 - After reducing the fraction, the answer is 93/28
- In mixed form: 39/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/12-9/21 45/12-18/21 45/24-9/21 45/12-9/42 45/12-27/21 45/36-9/21 45/12-9/63 45/12-45/21 45/60-9/21 45/12-63/21 45/84-9/21