$30!$ ends in $7$ zeroes. What is the digit preceding those zeroes?

The answer is 8.

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1, 2, 3, 4, 5, 6, 7, 8, 9, 10

now we will get 3 zeros from 10, 20, 30 and 4 zeros by multiplying 5, 15, 25 with 2, 2, 4 respectively.

after that we get..now multiply just the units digit in each successive multiplication

now 4

4 =6 => 68 = 8