A brick weighs one kilogramme plus half-a-brick.
What is its weight?
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Some do although most don't
There are many tricks to learning multiplication tables. One is the rhyme '8 times 8 fell on the floor and when it woke up it was 64'. Another is to know that all the nine multiplication tables add up to 9 up to 9 times 10.
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.
This is no magic method for getting faster at math. There are some tricks for mental arithmetic, but they may take you longer to master than they are worth. If you concentrate on the methods your are taught, you will probably get faster. More practice should also help, but that takes more time.
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