Telduivel. The counting devil.

Simon loves the book Telduivel, where a boy is taken on a mathematical adventure by a “counting devil. Many favourite themes are covered from a new angle. Here for example is Pascal’s triangle where Simon had to find a pattern by colouring the blocks that are divisible by 4. Simon even developed his own system to see if a number can be divided by 4, depending on its second digit and whether the number is even or odd:

Other patterns from the book:

He also enjoyed the Fibonacci chapter, last Friday at bedtime he fluently read nearly the entire chapter out loud to his sister. Here are two pages from the otherwise long chapter:

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