gistfile1.rb

module ExtendNumericRounding

  def roundup(nearest=10)
    self % nearest == 0 ? self : self + nearest - (self % nearest)
  end

  def rounddown(nearest=10)
    self % nearest == 0 ? self : self - (self % nearest)
  end

  def roundnearest(nearest=10)
    up = roundup(nearest)
    down = rounddown(nearest)
    if (up-self) <= (self-down)
      return up
    else
      return down
    end
  end

end
Numeric.send(:include, ExtendNumericRounding)