Numberphile revived an ancient multiplication trick—halves and doubles—also called Egyptian or Russian math, where you repeatedly halve one number and double the other. After crossing out rows with ...

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Practise your 2 times tables with this quiz. The 5 times table Learn all about the 5 times table and find out about multiples of 5. The 10 times table Discover the 10 times tables and try this quiz.

When you are doing division, it's helpful to use a written method. This can be especially useful if the numbers get too big to calculate in your head. If the number you are dividing by (this is called ...