Subtract 90/7 from 42/12
1st number: 3 6/12, 2nd number: 12 6/7
42/12 - 90/7 is -131/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 7 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
42/12 = 42 × 7/12 × 7 = 294/84 - Likewise, for the 2nd fraction, since 7 × 12 = 84,
90/7 = 90 × 12/7 × 12 = 1080/84 - Subtract the two like fractions:
294/84 - 1080/84 = 294 - 1080/84 = -786/84 - After reducing the fraction, the answer is -131/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/12-90/7 42/24-90/7 42/12-90/14 42/36-90/7 42/12-90/21 42/60-90/7 42/12-90/35 42/84-90/7 42/12-90/49