Subtract 8/14 from 20/42
20/42 - 8/14 is -2/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 14 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 42 × 1 = 42,
20/42 = 20 × 1/42 × 1 = 20/42 - Likewise, for the 2nd fraction, since 14 × 3 = 42,
8/14 = 8 × 3/14 × 3 = 24/42 - Subtract the two like fractions:
20/42 - 24/42 = 20 - 24/42 = -4/42 - After reducing the fraction, the answer is -2/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/42-8/14 20/42-16/14 20/84-8/14 20/42-8/28 60/42-8/14 20/42-24/14 20/42-8/42 20/42-40/14 20/42-8/70 20/42-56/14 20/42-8/98