Книга Рэймонда Смаллиана, вероятно, самый увлекательный сборник задач по логике. Около трехсот задач различной сложности ...

Rhyming anecdotes present opportunities for simple math activities and hints for solving.

It's much too slow --Adding is the way to go!Make clever groups before you start --Then add them in a way that's smart!MATH FOR ALL SEASONS will challenge every kid -- and every parent -- to open their minds and solve problems in new and ...

"Math enthusiasts of all ages will delight in this collection of more than 200 riddles drawn from every mathematical discipline.