Subtract 21/24 from 9/21
9/21 - 21/24 is -25/56.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 24 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
9/21 = 9 × 8/21 × 8 = 72/168 - Likewise, for the 2nd fraction, since 24 × 7 = 168,
21/24 = 21 × 7/24 × 7 = 147/168 - Subtract the two like fractions:
72/168 - 147/168 = 72 - 147/168 = -75/168 - After reducing the fraction, the answer is -25/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/21-21/24 9/21-42/24 9/42-21/24 9/21-21/48 27/21-21/24 9/21-63/24 9/63-21/24 9/21-21/72 45/21-21/24 63/21-21/24