Subtract 20/21 from 9/14
9/14 - 20/21 is -13/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 14 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 14 × 3 = 42,
9/14 = 9 × 3/14 × 3 = 27/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
20/21 = 20 × 2/21 × 2 = 40/42 - Subtract the two like fractions:
27/42 - 40/42 = 27 - 40/42 = -13/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/14-20/21 9/14-40/21 9/28-20/21 9/14-20/42 27/14-20/21 9/14-60/21 9/42-20/21 9/14-20/63 45/14-20/21 9/70-20/21 63/14-20/21 9/98-20/21