Subtract 30/9 from 21/27
1st number: 21/27, 2nd number: 3 3/9
21/27 - 30/9 is -23/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 9 is 27
Next, find the equivalent fraction of both fractional numbers with denominator 27 - For the 1st fraction, since 27 × 1 = 27,
21/27 = 21 × 1/27 × 1 = 21/27 - Likewise, for the 2nd fraction, since 9 × 3 = 27,
30/9 = 30 × 3/9 × 3 = 90/27 - Subtract the two like fractions:
21/27 - 90/27 = 21 - 90/27 = -69/27 - After reducing the fraction, the answer is -23/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/27-30/9 21/27-60/9 21/54-30/9 21/27-30/18 63/27-30/9 21/27-90/9 21/81-30/9 21/27-30/27 21/27-30/45 21/27-30/63