Good Source to Brush Up on Calculations by Hand?

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So, I understand the concepts of the quntitative and the chemistry section very well but I think it is horrible having to do weird divisions and multiplications (ex: 46.8/2.016 or 46.8 x 12.03). I can do it but it takes long and really sucks. Does anyone know of a good book or website that gives pointers on how to do messy math like this the most efficiently? Thanks again.

In such math cases, all it takes is just rounding, such as 48/2 or 48/12.

Yes, the manual calculations should be simple enough to do in your head.
However, you may get a question that absolutely requires you to do a bunch of manual calculations that aren't so simple.
Don't let your pride take over. Skip this type of question immediately. It is likely an 'experimental' question (one that won't count) and I surmise that it's there just to test your judgment (whether to skip or not)

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