Subtract 30/12 from 21/24
1st number: 21/24, 2nd number: 2 6/12
21/24 - 30/12 is -13/8.
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,
21/24 = 21 × 1/24 × 1 = 21/24 - Likewise, for the 2nd fraction, since 12 × 2 = 24,
30/12 = 30 × 2/12 × 2 = 60/24 - Subtract the two like fractions:
21/24 - 60/24 = 21 - 60/24 = -39/24 - After reducing the fraction, the answer is -13/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/24-30/12 21/24-60/12 21/48-30/12 21/24-30/24 63/24-30/12 21/24-90/12 21/72-30/12 21/24-30/36 21/24-30/60 21/24-30/84