Subtract 80/42 from 4/12
1st number: 4/12, 2nd number: 1 38/42
4/12 - 80/42 is -11/7.
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,
4/12 = 4 × 7/12 × 7 = 28/84 - Likewise, for the 2nd fraction, since 42 × 2 = 84,
80/42 = 80 × 2/42 × 2 = 160/84 - Subtract the two like fractions:
28/84 - 160/84 = 28 - 160/84 = -132/84 - After reducing the fraction, the answer is -11/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/12-80/42 4/24-80/42 4/12-80/84 4/36-80/42 20/12-80/42 4/60-80/42 28/12-80/42 4/84-80/42