Ruby and her two best friends are excited about going to the amusement park. That is, until they discover that the rides they want to go on have seats for two, not three. Someone will have to ride alone--or will they?

With engaging stories that connect math to kids' everyday lives, each book in the Teachers' Choice Award-winning Math Matters series focuses on a single concept and reinforces math vocabulary and skills. Bonus activities in the back of each book feature math and reading comprehension questions, and even more free activities online add to the fun! (Math topic: Odd/Even Numbers)