Assuming that a piece of paper is .01 cm
And the distance from the Earth to the Moon is 384,000 km
How many times would you have to double that paper's thickness before you'd have a stack of paper high enough to reach the moon?
It seems like it would take a while: First 0.01 cm, then it goes to 0.02 cm, then 0.04 cm, etc.
Answer: 42 times. That's it.
Behold the power of the exponential function, and it's something that our little brains have a hard time grasping.