Subtract 30/27 from 30/42
1st number: 30/42, 2nd number: 1 3/27
30/42 - 30/27 is -25/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 27 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 27 × 14 = 378,
30/27 = 30 × 14/27 × 14 = 420/378 - Subtract the two like fractions:
270/378 - 420/378 = 270 - 420/378 = -150/378 - After reducing the fraction, the answer is -25/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/42-30/27 30/42-60/27 30/84-30/27 30/42-30/54 90/42-30/27 30/42-90/27 30/42-30/81