The remainder when the number 9999999925 is divided by 9 is _______.

To find the remainder of a number divided by 9, you can add up the digits of the number and then divide that sum by 9. The remainder of that operation would be the same as the remainder of the original number divided by 9.

Here are the steps:

1. Add up the digits of 9999999925: 9+9+9+9+9+9+9+9+9+2+5 = 89
2. Divide 89 by 9: 89 ÷ 9 = 9 remainder 8

So, the remainder when the number 9999999925 is divided by 9 is 8.