Subtract 30/21 from 6/9
1st number: 6/9, 2nd number: 1 9/21
6/9 - 30/21 is -16/21.
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,
30/21 = 30 × 3/21 × 3 = 90/63 - Subtract the two like fractions:
42/63 - 90/63 = 42 - 90/63 = -48/63 - After reducing the fraction, the answer is -16/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/9-30/21 6/9-60/21 6/18-30/21 6/9-30/42 18/9-30/21 6/9-90/21 6/27-30/21 6/9-30/63 30/9-30/21 6/45-30/21 42/9-30/21 6/63-30/21