How many possibilities are there with the four digit numbers 0000-9999 while the first number cannot be 0 or 9?

The first digit can be any one of 8. For each of these . . .

The second digit can be any one of 10. For each of these . . .

The third digit can be any one of 10. For each of these . . .

The fourth digit can be any one of 8.

Total possibilities = (8 x 10 x 10 x 8) = 6,400