Subtract 24/9 from 21/84
1st number: 21/84, 2nd number: 2 6/9
21/84 - 24/9 is -29/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 9 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 84 × 3 = 252,
21/84 = 21 × 3/84 × 3 = 63/252 - Likewise, for the 2nd fraction, since 9 × 28 = 252,
24/9 = 24 × 28/9 × 28 = 672/252 - Subtract the two like fractions:
63/252 - 672/252 = 63 - 672/252 = -609/252 - After reducing the fraction, the answer is -29/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/84-24/9 21/84-48/9 21/84-24/18 63/84-24/9 21/84-72/9 21/84-24/27 21/84-24/45 21/84-24/63