Subtract 3/24 from 3/21
3/21 - 3/24 is 1/56.
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,
3/21 = 3 × 8/21 × 8 = 24/168 - Likewise, for the 2nd fraction, since 24 × 7 = 168,
3/24 = 3 × 7/24 × 7 = 21/168 - Subtract the two like fractions:
24/168 - 21/168 = 24 - 21/168 = 3/168 - After reducing the fraction, the answer is 1/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/21-3/24 3/21-6/24 3/42-3/24 3/21-3/48 9/21-3/24 3/21-9/24 3/63-3/24 3/21-3/72 15/21-3/24 3/21-15/24 3/21-21/24