Subtract 84/9 from 8/21
1st number: 8/21, 2nd number: 9 3/9
8/21 - 84/9 is -188/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 9 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
8/21 = 8 × 3/21 × 3 = 24/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
84/9 = 84 × 7/9 × 7 = 588/63 - Subtract the two like fractions:
24/63 - 588/63 = 24 - 588/63 = -564/63 - After reducing the fraction, the answer is -188/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/21-84/9 8/42-84/9 8/21-84/18 24/21-84/9 8/63-84/9 8/21-84/27 40/21-84/9 8/21-84/45 56/21-84/9 8/21-84/63