Re: Too slow with calculations The only way that I'm aware of to really do this is, unfortunately, practice.
At school I was great at mental arithmetic. After leaving uni where we all used calculators I realised I couldn't add up in my head any more.
Now whenever I have things to add up take away. I do it in my head the first time and then check with a calculator.
There are lots of brain training type games out there now (Mrs Linnear is currently working out on her new DS!). Maybe something along those lines or even a puzzle book. I'm sure that there are some out there that have number puzzles. Doing these may help flex the mental muscles without feeling like you're revising!
Good luck
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Linnear MRPharmS
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