From AQA website – presentations and accompanying worksheets on aspects of maths used in the Biology course e.g. standard form, ratios.
Lots of maths for biology activities here, from big numbers to using a haemocytometer.
Information and problems on using -log [H+] to calculate pH.
Video from Wellcome Trust big picture on how to use the chi squared test.
Information on graphs using log scale.
Big Picture resource from Wellcome, Number Crunching talks about how science uses statistics.