Subtract 21/9 from 8/28
1st number: 8/28, 2nd number: 2 3/9
8/28 - 21/9 is -43/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 9 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 28 × 9 = 252,
8/28 = 8 × 9/28 × 9 = 72/252 - Likewise, for the 2nd fraction, since 9 × 28 = 252,
21/9 = 21 × 28/9 × 28 = 588/252 - Subtract the two like fractions:
72/252 - 588/252 = 72 - 588/252 = -516/252 - After reducing the fraction, the answer is -43/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/28-21/9 8/28-42/9 8/56-21/9 8/28-21/18 24/28-21/9 8/28-63/9 8/84-21/9 8/28-21/27 40/28-21/9 8/28-21/45 56/28-21/9 8/28-21/63