Subtract 90/9 from 20/42
1st number: 20/42, 2nd number: 10 0/9
20/42 - 90/9 is -200/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 9 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 42 × 3 = 126,
20/42 = 20 × 3/42 × 3 = 60/126 - Likewise, for the 2nd fraction, since 9 × 14 = 126,
90/9 = 90 × 14/9 × 14 = 1260/126 - Subtract the two like fractions:
60/126 - 1260/126 = 60 - 1260/126 = -1200/126 - After reducing the fraction, the answer is -200/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/42-90/9 20/84-90/9 20/42-90/18 60/42-90/9 20/42-90/27 20/42-90/45 20/42-90/63