Subtract 15/24 from 28/21
1st number: 1 7/21, 2nd number: 15/24
28/21 - 15/24 is 17/24.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 24 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
28/21 = 28 × 8/21 × 8 = 224/168 - Likewise, for the 2nd fraction, since 24 × 7 = 168,
15/24 = 15 × 7/24 × 7 = 105/168 - Subtract the two like fractions:
224/168 - 105/168 = 224 - 105/168 = 119/168 - After reducing the fraction, the answer is 17/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/21-15/24 28/21-30/24 28/42-15/24 28/21-15/48 84/21-15/24 28/21-45/24 28/63-15/24 28/21-15/72 28/21-75/24