1000.class # => Fixnum
10000000000.class # => Bignum
(2**30 - 1).class # => Fixnum
(2**30).class # => Bignum
small = 1000
big = small ** 5 # => 1000000000000000
big.class # => Bignum
smaller = big / big # => 1
smaller.class # => Fixnum
0.01.class # => Float
1.0.class # => Float
10000000000.00000000001.class # => Float