Subtract 6/8 from 12/81
12/81 - 6/8 is -65/108.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 8 is 648
Next, find the equivalent fraction of both fractional numbers with denominator 648 - For the 1st fraction, since 81 × 8 = 648,
12/81 = 12 × 8/81 × 8 = 96/648 - Likewise, for the 2nd fraction, since 8 × 81 = 648,
6/8 = 6 × 81/8 × 81 = 486/648 - Subtract the two like fractions:
96/648 - 486/648 = 96 - 486/648 = -390/648 - After reducing the fraction, the answer is -65/108
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/81-6/8 12/81-12/8 12/81-6/16 36/81-6/8 12/81-18/8 12/81-6/24 60/81-6/8 12/81-30/8 12/81-6/40 84/81-6/8 12/81-42/8 12/81-6/56