Subtract 40/6 from 70/81
1st number: 70/81, 2nd number: 6 4/6
70/81 - 40/6 is -470/81.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 6 is 162
Next, find the equivalent fraction of both fractional numbers with denominator 162 - For the 1st fraction, since 81 × 2 = 162,
70/81 = 70 × 2/81 × 2 = 140/162 - Likewise, for the 2nd fraction, since 6 × 27 = 162,
40/6 = 40 × 27/6 × 27 = 1080/162 - Subtract the two like fractions:
140/162 - 1080/162 = 140 - 1080/162 = -940/162 - After reducing the fraction, the answer is -470/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/81-80/6 70/81-40/12 70/81-40/18 70/81-40/30 70/81-40/42