- Ruby has two categories of numbers - integers and floating-point (also called floats).
- Integers are whole numbers that can be positive or negative but cannot be fractions.
- Depending on their size, integers can have the class
- Floats are numbers with a decimal place.
x = 5.5
x = 5
x = 11122233344455566677
Bignum # basically, Bignum is a very large number
# [read this article for more info](http://ruby-doc.org/core-2.0.0/Bignum.html)