Instance Method Calculator

gistfile1.rb

class Numeric
  def add(num)
     self + num
  end

  def subtract(num)
    self - num
  end

  def multiply(num)
    self * num
  end

  def divide_by(num)
    result = self.to_f / num.to_f
  end
end


puts 8.divide_by(3)