Question

Instead of the three dots, write a digit to make the fraction reducible. (Find all possible cases.) 6...5/1...5

Answer 1

All digits. (0 to 9)

Explanation:

Since it ends in 5, you can always divide it by 5, so therefore, all digits are possible.

Answer 2

Any digit will make the fraction reducible, since both numerator and denominator numbers end in 5. A factor of 5 can always be removed. If your ... is restricted to a single digit, that digit can be any of {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}.