Subtract 9/12 from 28/72
28/72 - 9/12 is -13/36.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 12 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 72 × 1 = 72,
28/72 = 28 × 1/72 × 1 = 28/72 - Likewise, for the 2nd fraction, since 12 × 6 = 72,
9/12 = 9 × 6/12 × 6 = 54/72 - Subtract the two like fractions:
28/72 - 54/72 = 28 - 54/72 = -26/72 - After reducing the fraction, the answer is -13/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/72-9/12 28/72-18/12 28/72-9/24 84/72-9/12 28/72-27/12 28/72-9/36 28/72-45/12 28/72-9/60 28/72-63/12 28/72-9/84