Subtract 15/6 from 6/21
1st number: 6/21, 2nd number: 2 3/6
6/21 - 15/6 is -31/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 6 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 21 × 2 = 42,
6/21 = 6 × 2/21 × 2 = 12/42 - Likewise, for the 2nd fraction, since 6 × 7 = 42,
15/6 = 15 × 7/6 × 7 = 105/42 - Subtract the two like fractions:
12/42 - 105/42 = 12 - 105/42 = -93/42 - After reducing the fraction, the answer is -31/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/21-15/6 6/21-30/6 6/42-15/6 6/21-15/12 18/21-15/6 6/21-45/6 6/63-15/6 6/21-15/18 30/21-15/6 6/21-75/6 6/21-15/30 42/21-15/6 6/21-15/42