Subtract 7/24 from 5/21
5/21 - 7/24 is -3/56.
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,
5/21 = 5 × 8/21 × 8 = 40/168 - Likewise, for the 2nd fraction, since 24 × 7 = 168,
7/24 = 7 × 7/24 × 7 = 49/168 - Subtract the two like fractions:
40/168 - 49/168 = 40 - 49/168 = -9/168 - After reducing the fraction, the answer is -3/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/21-7/24 5/21-14/24 5/42-7/24 5/21-7/48 15/21-7/24 5/21-21/24 5/63-7/24 5/21-7/72 25/21-7/24 5/21-35/24 35/21-7/24 5/21-49/24