Subtract 21/9 from 9/28
1st number: 9/28, 2nd number: 2 3/9
9/28 - 21/9 is -169/84.
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,
9/28 = 9 × 9/28 × 9 = 81/252 - Likewise, for the 2nd fraction, since 9 × 28 = 252,
21/9 = 21 × 28/9 × 28 = 588/252 - Subtract the two like fractions:
81/252 - 588/252 = 81 - 588/252 = -507/252 - After reducing the fraction, the answer is -169/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/28-21/9 9/28-42/9 9/56-21/9 9/28-21/18 27/28-21/9 9/28-63/9 9/84-21/9 9/28-21/27 45/28-21/9 9/28-21/45 63/28-21/9 9/28-21/63