Subtract 49/42 from 42/54
1st number: 42/54, 2nd number: 1 7/42
42/54 - 49/42 is -7/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 54 and 42 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 54 × 7 = 378,
42/54 = 42 × 7/54 × 7 = 294/378 - Likewise, for the 2nd fraction, since 42 × 9 = 378,
49/42 = 49 × 9/42 × 9 = 441/378 - Subtract the two like fractions:
294/378 - 441/378 = 294 - 441/378 = -147/378 - After reducing the fraction, the answer is -7/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/54-49/42 42/54-98/42 42/54-49/84