Subtract 21/12 from 40/24
1st number: 1 16/24, 2nd number: 1 9/12
40/24 - 21/12 is -1/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 12 is 24
Next, find the equivalent fraction of both fractional numbers with denominator 24 - For the 1st fraction, since 24 × 1 = 24,
40/24 = 40 × 1/24 × 1 = 40/24 - Likewise, for the 2nd fraction, since 12 × 2 = 24,
21/12 = 21 × 2/12 × 2 = 42/24 - Subtract the two like fractions:
40/24 - 42/24 = 40 - 42/24 = -2/24 - After reducing the fraction, the answer is -1/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/24-21/12 40/24-42/12 40/48-21/12 40/24-21/24 40/24-63/12 40/72-21/12 40/24-21/36 40/24-21/60 40/24-21/84