Subtract 15/21 from 28/14
1st number: 2 0/14, 2nd number: 15/21
28/14 - 15/21 is 9/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 14 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 14 × 3 = 42,
28/14 = 28 × 3/14 × 3 = 84/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
15/21 = 15 × 2/21 × 2 = 30/42 - Subtract the two like fractions:
84/42 - 30/42 = 84 - 30/42 = 54/42 - 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: 56/14-15/21 28/14-30/21 28/14-15/42 84/14-15/21 28/14-45/21 28/42-15/21 28/14-15/63 28/14-75/21 28/70-15/21 28/98-15/21