Can someone check my thinking here?

I've never really thought about any engine with more than 4 cylinders, but was trying to sort out a niggle with the mondeo tonight and started thinking about V6's and bigger...

Does each spark must move the crank 180 degrees as with a 4 pot? Surely it must do?

Therefore, on a V6, does the crank rotate 3 full turns before the engine has done a full firing cycle (i.e before #1 is back at TDC ready for another spark), and so a V8 must go 4 crank rotations?

How in the hell does a 5 cylinder lump work?

Please help, or I'll get no sleep!

Neil.