Subtract 21/42 from 14/21
14/21 - 21/42 is 1/6.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 42 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 21 × 2 = 42,
14/21 = 14 × 2/21 × 2 = 28/42 - Likewise, for the 2nd fraction, since 42 × 1 = 42,
21/42 = 21 × 1/42 × 1 = 21/42 - Subtract the two like fractions:
28/42 - 21/42 = 28 - 21/42 = 7/42 - After reducing the fraction, the answer is 1/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 28/21-21/42 14/42-21/42 14/21-21/84 42/21-21/42 14/21-63/42 14/63-21/42 70/21-21/42 98/21-21/42