Subtract 45/42 from 45/12
1st number: 3 9/12, 2nd number: 1 3/42
45/12 - 45/42 is 75/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 42 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 42 × 2 = 84,
45/42 = 45 × 2/42 × 2 = 90/84 - Subtract the two like fractions:
315/84 - 90/84 = 315 - 90/84 = 225/84 - After reducing the fraction, the answer is 75/28
- In mixed form: 219/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/12-45/42 45/12-90/42 45/24-45/42 45/12-45/84 45/36-45/42 45/60-45/42 45/84-45/42