Subtract 15/21 from 24/12
1st number: 2 0/12, 2nd number: 15/21
24/12 - 15/21 is 9/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
24/12 = 24 × 7/12 × 7 = 168/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
15/21 = 15 × 4/21 × 4 = 60/84 - Subtract the two like fractions:
168/84 - 60/84 = 168 - 60/84 = 108/84 - After reducing the fraction, the answer is 9/7
- In mixed form: 12/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 48/12-15/21 24/12-30/21 24/12-15/42 72/12-15/21 24/12-45/21 24/36-15/21 24/12-15/63 24/12-75/21 24/60-15/21 24/84-15/21