Subtract 3/81 from 5/8, Solve 5/8

Subtract 3/81 from 5/8

5/8 - 3/81 is 127/216.

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,
5/8 = 5 × 81/8 × 81 = 405/648
Likewise, for the 2nd fraction, since 81 × 8 = 648,
3/81 = 3 × 8/81 × 8 = 24/648
Subtract the two like fractions:
405/648 - 24/648 = 405 - 24/648 = 381/648
After reducing the fraction, the answer is 127/216

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad