There are a bunch of tricks to make figuring math problems easier. See the discussion for some that I'll post.
he did 101010101044566899 tricks
he did 101010101044566899 tricks
There are a lot of little tricks, but the best one of all is this: During the whole school year before the Olympiad, do all of your homework, and learn the math. That way, no matter what problem they throw at you in the Olympiad, you'll be able to solve it, and you won't need any other tricks.
Tricks - novel - has 640 pages.
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There are many magicians who post videos of their tricks and performances on their websites.
infinity
90
maths
Infinitely many.
Infinitely many.
50 hat tricks totall