I'm new to maths teaching, sorry for such a basic question. Tried Googling it, couldn't find an answer to my query. In a Pearson revision guide I found a question which I simplify as "How many odd numbers are there between 1000 & 9999" - now as an English teacher I'd say that 'between' clearly means NOT including 1000 & 9999, but the book's answer has included 9999. My instinct is that the question would be clearer if it said "from... to...". What do you think?