Subtract 20/42 from 1/9
1/9 - 20/42 is -23/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 42 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 9 × 14 = 126,
1/9 = 1 × 14/9 × 14 = 14/126 - Likewise, for the 2nd fraction, since 42 × 3 = 126,
20/42 = 20 × 3/42 × 3 = 60/126 - Subtract the two like fractions:
14/126 - 60/126 = 14 - 60/126 = -46/126 - After reducing the fraction, the answer is -23/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/9-20/42 1/9-40/42 1/18-20/42 1/9-20/84 3/9-20/42 1/9-60/42 1/27-20/42 5/9-20/42 1/45-20/42 7/9-20/42 1/63-20/42