This resource attempts to emulate a cell phone calculator. The teacher can demonstrate how to use the simple calculators to do useful real world maths. At the moment 2 types of real world questions can be generated by the resource: percentage discounts and area.

Instructions
http://www.teacherled.com/2009/01/03/cell-phone-maths/

Resource
http://www.teacherled.com/resources/cellphone/cellphoneload.html