Subtract 7/81 from 84/18
1st number: 4 12/18, 2nd number: 7/81
84/18 - 7/81 is 371/81.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 81 is 162
Next, find the equivalent fraction of both fractional numbers with denominator 162 - For the 1st fraction, since 18 × 9 = 162,
84/18 = 84 × 9/18 × 9 = 756/162 - Likewise, for the 2nd fraction, since 81 × 2 = 162,
7/81 = 7 × 2/81 × 2 = 14/162 - Subtract the two like fractions:
756/162 - 14/162 = 756 - 14/162 = 742/162 - After reducing the fraction, the answer is 371/81
- In mixed form: 447/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/18-14/81 84/36-7/81 84/18-21/81 84/54-7/81 84/18-35/81 84/90-7/81 84/18-49/81