Subtract 14/28 from 4/21
4/21 - 14/28 is -13/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 28 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
4/21 = 4 × 4/21 × 4 = 16/84 - Likewise, for the 2nd fraction, since 28 × 3 = 84,
14/28 = 14 × 3/28 × 3 = 42/84 - Subtract the two like fractions:
16/84 - 42/84 = 16 - 42/84 = -26/84 - After reducing the fraction, the answer is -13/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/21-14/28 4/42-14/28 4/21-14/56 12/21-14/28 4/21-42/28 4/63-14/28 4/21-14/84 20/21-14/28 4/21-70/28 28/21-14/28 4/21-98/28