Subtract 9/4 from 28/81
1st number: 28/81, 2nd number: 2 1/4
28/81 - 9/4 is -617/324.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 4 is 324
Next, find the equivalent fraction of both fractional numbers with denominator 324 - For the 1st fraction, since 81 × 4 = 324,
28/81 = 28 × 4/81 × 4 = 112/324 - Likewise, for the 2nd fraction, since 4 × 81 = 324,
9/4 = 9 × 81/4 × 81 = 729/324 - Subtract the two like fractions:
112/324 - 729/324 = 112 - 729/324 = -617/324
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/81-9/4 28/81-18/4 28/81-9/8 84/81-9/4 28/81-27/4 28/81-9/12 28/81-45/4 28/81-9/20 28/81-63/4 28/81-9/28