Subtract 40/9 from 21/24
1st number: 21/24, 2nd number: 4 4/9
21/24 - 40/9 is -257/72.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 9 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 24 × 3 = 72,
21/24 = 21 × 3/24 × 3 = 63/72 - Likewise, for the 2nd fraction, since 9 × 8 = 72,
40/9 = 40 × 8/9 × 8 = 320/72 - Subtract the two like fractions:
63/72 - 320/72 = 63 - 320/72 = -257/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/24-40/9 21/24-80/9 21/48-40/9 21/24-40/18 63/24-40/9 21/72-40/9 21/24-40/27 21/24-40/45 21/24-40/63