Everybody knows that to make it easy for a child to learn something, he needs to be interested. If it is a foreign language, the sooner the better. But mathematics is not an exception. Children are special creatures to carry them away, it is not necessary to carry the skills of adult life into their world. Don't think that in order to show the kids interesting mathematics, we have to sit them down at the table, stick notebooks, cards, give them tasks and then check if they have done everything they were told to do. It is possible to scare away the child at once, to make it clear that the world is built on obedience and orders and there is no room for creativity or imagination. On the playground you can easily find a proud and happy grandmother, who, looking at all the kids in the sandbox or slide, declares: "Our grandmother already knows all the numbers up to 20. How about yours?" Often it does not do any good, because knowing the sequence of words (even if numerals) and understand wha