What mathematical skills does testing require?

I've just been wondering what mathematical skills I would need to become a software tester.

Kairu I wonder what has stimulated your question? Why do you think that you need mathematical skills? I'd say the most important things in no particular order are: Good broad IT understanding. A logical (but not specifically mathematical) mind. Experience of people using applications. Try to be an end user yourself and use as many different applications as you can, and be critical. Good communication skills. With the type of tools and applications available today, even if limiting yourself to UI testing, you will need some level of programming skills. Being a detective like Sherlock Holmes is very important. Logical thinking is vital. Appreciating you cannot do it all so knowing when to stop and thus awareness of risk assessment. When looking at performance, my own specialist field, a knowledge of basic statistics is good. Still amazes me the number of people who set or monitor Service Level Agreements (SLAs) who do not know the difference between a percentage and a percentile. When I started out many years ago I arrived at IT because I studied mathematics. I'm sure many ITers liked mathematics more than say literature. But I do not think it is particularly relevant.