For given positive integer n, take factorial of that number. How many trailing zeros does it have?
Example: factorial(11) = 39916800
Its last zero-digit count is 2.
Optional: Can you make an efficient algorithm for a very large n?
radius of a spherical planet
find the roots of a quadratic equation
length of string on cylinder
Product of elements in row
Equal temperament - musical notes and frequency
Make a rainbow matrix (follow-up to checkerboard matrix)
Smallest n, for n! to have m trailing zero digits
Number of paths on a 3d grid
Under the sea: Snell's law & total internal reflection
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