Do you consider that mathematics can cause a boredom only? And you are somewhere right!In loneliness even enthralling business can compel to feel miserable. Much merrier to decide the most interesting tasks in a good company - such, as scientific family of professor Перельмана. All three generations of this family very love such employments, in fact in any age it is pleasant to feel itself clever and resourceful.Entertaining tasks, original rebuses and puzzles that will decide together representatives of the united family of Перельмана will help to improve memory, develop attention, perfect the spatial and creative thinking and even to train intuition. And wise remarks and thin humour of senior generation and amusing dialogues of Прохора and Вари - junior family members - will deliver quite a bit pleasure and will give possibility miraculously to conduct time.It is perfect the illustrated edition will become an excellent gift for curious children.For middle and senior school age.