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Forgotten Number

I have forgotten the number of the combination of the lock on my briefcase. I did have a method for remembering it...

Powerful Factorial

6! = 6 x 5 x 4 x 3 x 2 x 1. The highest power of 2 that divides exactly into 6! is 4 since (6!) / (2^4 ) = 45. What is the highest power of two that divides exactly into 100!?

Trailing Zeros

How many zeros does 50! have at the end?

Factoring Factorials

Age 11 to 14 Challenge Level:
Possible extension.
This problem is a special case of Factorial Fun.

Possible support
See also Fac Finding and Powerful Factorialwhich are also special cases.