Subtract 15/21 from 6/9
6/9 - 15/21 is -1/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 21 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 9 × 7 = 63,
6/9 = 6 × 7/9 × 7 = 42/63 - Likewise, for the 2nd fraction, since 21 × 3 = 63,
15/21 = 15 × 3/21 × 3 = 45/63 - Subtract the two like fractions:
42/63 - 45/63 = 42 - 45/63 = -3/63 - After reducing the fraction, the answer is -1/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/9-15/21 6/9-30/21 6/18-15/21 6/9-15/42 18/9-15/21 6/9-45/21 6/27-15/21 6/9-15/63 30/9-15/21 6/9-75/21 6/45-15/21 42/9-15/21 6/63-15/21