For those of you who attend the course on June 23rd 1999 : developing pupils' numeracy in the secondary mathematics classroom, this is the spreadsheet from Ken Smith.
The keys you will need are F9 and Ctrl+F9.
If you find it doesn't work or you get lots of errors instead of the recalculations then you need to follow this routine to upgrade Excel:
Tools > Add-Ins > Analysis ToolPak - VBA
You may find that you have to 'add' it in every time you reload Excel.
The answers are hidden but where you would expect them to be. Highlight the column and change the font colour to red, if you need a set!
Right-click for the menu to download this spreadsheet. Numsand