Subtract 70/81 from 2/8
2/8 - 70/81 is -199/324.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 81 is 648
Next, find the equivalent fraction of both fractional numbers with denominator 648 - For the 1st fraction, since 8 × 81 = 648,
2/8 = 2 × 81/8 × 81 = 162/648 - Likewise, for the 2nd fraction, since 81 × 8 = 648,
70/81 = 70 × 8/81 × 8 = 560/648 - Subtract the two like fractions:
162/648 - 560/648 = 162 - 560/648 = -398/648 - After reducing the fraction, the answer is -199/324
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/8-70/81 2/16-70/81 6/8-70/81 2/24-70/81 10/8-70/81 2/40-70/81 14/8-70/81 2/56-70/81