Subtract 18/81 from 9/4
1st number: 2 1/4, 2nd number: 18/81
9/4 - 18/81 is 73/36.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 81 is 324
Next, find the equivalent fraction of both fractional numbers with denominator 324 - For the 1st fraction, since 4 × 81 = 324,
9/4 = 9 × 81/4 × 81 = 729/324 - Likewise, for the 2nd fraction, since 81 × 4 = 324,
18/81 = 18 × 4/81 × 4 = 72/324 - Subtract the two like fractions:
729/324 - 72/324 = 729 - 72/324 = 657/324 - After reducing the fraction, the answer is 73/36
- In mixed form: 21/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/4-18/81 9/4-36/81 9/8-18/81 27/4-18/81 9/4-54/81 9/12-18/81 45/4-18/81 9/4-90/81 9/20-18/81 63/4-18/81 9/28-18/81