Subtract 70/81 from 30/18
1st number: 1 12/18, 2nd number: 70/81
30/18 - 70/81 is 65/81.
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,
30/18 = 30 × 9/18 × 9 = 270/162 - Likewise, for the 2nd fraction, since 81 × 2 = 162,
70/81 = 70 × 2/81 × 2 = 140/162 - Subtract the two like fractions:
270/162 - 140/162 = 270 - 140/162 = 130/162 - After reducing the fraction, the answer is 65/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/18-70/81 30/36-70/81 90/18-70/81 30/54-70/81 30/90-70/81