Subtract 18/9 from 12/28
1st number: 12/28, 2nd number: 2 0/9
12/28 - 18/9 is -11/7.
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,
12/28 = 12 × 9/28 × 9 = 108/252 - Likewise, for the 2nd fraction, since 9 × 28 = 252,
18/9 = 18 × 28/9 × 28 = 504/252 - Subtract the two like fractions:
108/252 - 504/252 = 108 - 504/252 = -396/252 - After reducing the fraction, the answer is -11/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/28-18/9 12/28-36/9 12/56-18/9 36/28-18/9 12/28-54/9 12/84-18/9 12/28-18/27 60/28-18/9 12/28-90/9 12/28-18/45 84/28-18/9 12/28-18/63