To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
bought the book for my granddaughter for school. Her only negative thoughts about it are the fact that her teachers copy of the book is smaller print and therefore the page numbers are different making it difficult to follow the teachers instructions..