Henry Arthur Pluckrose was the founder, in 1968, of Prior Weston primary school in London. He established a teaching model that aroused international interest and admiration. He was also a prolific author, editor, journalist and lecturer on educational and other subjects.
He published more than 300 books and touched the hearts and minds of thousands, perhaps millions.
Before reading this book, a young reader may need someone to let them know how to count, what a pair is, what odd and even are, and be able to realize that what they are looking at may not have the answer in agreement with the term in the question. Some of the questions ask the reader to think beyond what is represented. That's a good thing. It might be upsetting for some children.