Subtract 3/21 from 7/24
7/24 - 3/21 is 25/168.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 21 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 24 × 7 = 168,
7/24 = 7 × 7/24 × 7 = 49/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
3/21 = 3 × 8/21 × 8 = 24/168 - Subtract the two like fractions:
49/168 - 24/168 = 49 - 24/168 = 25/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/24-3/21 7/24-6/21 7/48-3/21 7/24-3/42 21/24-3/21 7/24-9/21 7/72-3/21 7/24-3/63 35/24-3/21 7/24-15/21 49/24-3/21