class Fixnum

def div(n)

Standard in ruby 1.8.7+. See official documentation[http://ruby-doc.org/core-1.9/classes/Fixnum.html] 
def div(n)
  (self / n).to_i
end unless method_defined? :div

def fdiv(n)

Standard in ruby 1.8.7+. See official documentation[http://ruby-doc.org/core-1.9/classes/Fixnum.html] 
def fdiv(n)
  to_f / n
end unless method_defined? :fdiv