Take a starting number and apply a set of instructions to it to achieve a finishing number.

Click create to generate a new start number and instructions. The start number will not appear. You can choose whether to show the start number or the answer. Showing the answer modifies the puzzle so that students have to do the inverse of the instructions to find the start number.

A timer can be applied. The length of time available for each instruction can be adjusted. When the length of time has passed a light appears below the instruction to show the students that they should move on.

Instructions
http://www.teacherled.com/2008/08/31/follow-on-maths/

Resource
http://www.teacherled.com/resources/followon/followonload.html