Subtract 50/54 from 30/42
30/42 - 50/54 is -40/189.
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,
30/42 = 30 × 9/42 × 9 = 270/378 - Likewise, for the 2nd fraction, since 54 × 7 = 378,
50/54 = 50 × 7/54 × 7 = 350/378 - Subtract the two like fractions:
270/378 - 350/378 = 270 - 350/378 = -80/378 - After reducing the fraction, the answer is -40/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/42-50/54 30/84-50/54 90/42-50/54