Arithmetic is where the answer is right and everything is nice
and you can look out of the window and see the blue sky--
or the answer is wrong and you have to start all over and
try again and see how it comes out this time.
If you take a number and double it and double it again and then
double it a few more times, the number gets bigger and bigger
and goes higher and higher and only arithmetic can tell you
what the number is when you decide to quit doubling.