Roots and tables of integers to memorise

Hello, what roots and tables should we ideally memorise to help with solving problems quicker? By tables I mean multiples of integer (hopefully the same term is used in US :p). I noticed I was answering questions quickly where I happened to still remember roots that I learnt ages ago. But it did help. And also got slightly frustrated for one’s that I almost remembered.

I only remember \sqrt{2} and \sqrt{3} and the multiplication table up to 12. There’s a square root button on the GRE calculator if you need to find any other ones.

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