sorry,
There is no A level (or GCSE for that matter) maths at S2. All I meant was get used to looking at numbers, sorting them in your head and doing very quick but basic mental maths.
If you have been out of school for a while you might find this a bit rusty. As paperclip says, the maths in the collisions task is ( I hope) just a distraction, but there is an element of maths in the sort task. Not very hard in principle, but when you have sub to seconds to process all the info and make a descision a certain degree of comfort with number would, imho, be useful.
Sorry again if I alarmed anyone - wasnt my intention.