Subtract 50/42 from 90/27
1st number: 3 9/27, 2nd number: 1 8/42
90/27 - 50/42 is 15/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 42 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 27 × 14 = 378,
90/27 = 90 × 14/27 × 14 = 1260/378 - Likewise, for the 2nd fraction, since 42 × 9 = 378,
50/42 = 50 × 9/42 × 9 = 450/378 - Subtract the two like fractions:
1260/378 - 450/378 = 1260 - 450/378 = 810/378 - After reducing the fraction, the answer is 15/7
- In mixed form: 21/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/54-50/42 90/27-50/84 90/81-50/42