Subtract 75/54 from 28/42
1st number: 28/42, 2nd number: 1 21/54
28/42 - 75/54 is -13/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 54 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 42 × 9 = 378,
28/42 = 28 × 9/42 × 9 = 252/378 - Likewise, for the 2nd fraction, since 54 × 7 = 378,
75/54 = 75 × 7/54 × 7 = 525/378 - Subtract the two like fractions:
252/378 - 525/378 = 252 - 525/378 = -273/378 - After reducing the fraction, the answer is -13/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/42-75/54 28/84-75/54 84/42-75/54