Subtract 90/27 from 2/42
1st number: 2/42, 2nd number: 3 9/27
2/42 - 90/27 is -23/7.
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,
2/42 = 2 × 9/42 × 9 = 18/378 - Likewise, for the 2nd fraction, since 27 × 14 = 378,
90/27 = 90 × 14/27 × 14 = 1260/378 - Subtract the two like fractions:
18/378 - 1260/378 = 18 - 1260/378 = -1242/378 - After reducing the fraction, the answer is -23/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/42-90/27 2/84-90/27 2/42-90/54 6/42-90/27 2/42-90/81 10/42-90/27 14/42-90/27