Subtract 14/20 from 9/21
9/21 - 14/20 is -19/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 21 × 20 = 420,
9/21 = 9 × 20/21 × 20 = 180/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
14/20 = 14 × 21/20 × 21 = 294/420 - Subtract the two like fractions:
180/420 - 294/420 = 180 - 294/420 = -114/420 - After reducing the fraction, the answer is -19/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/21-14/20 9/21-28/20 9/42-14/20 9/21-14/40 27/21-14/20 9/21-42/20 9/63-14/20 9/21-14/60 45/21-14/20 9/21-70/20 63/21-14/20 9/21-98/20