Subtract 49/42 from 45/12
1st number: 3 9/12, 2nd number: 1 7/42
45/12 - 49/42 is 31/12.
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,
49/42 = 49 × 2/42 × 2 = 98/84 - Subtract the two like fractions:
315/84 - 98/84 = 315 - 98/84 = 217/84 - After reducing the fraction, the answer is 31/12
- In mixed form: 27/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/12-49/42 45/12-98/42 45/24-49/42 45/12-49/84 45/36-49/42 45/60-49/42 45/84-49/42