500 all-color math drill problems, for 5-year-olds, designed to be solved in 30 minutes. - Age: 5 years old - Number of problems: 500 - Color: All color - Learning method: Solvable in 30 minutes - Features: 3-stage structure - Content: Math drill Thank you for viewing. I used it by copying the content, so it's still in good condition. I haven't written in it, but I apologize if there are any marks. m(_ _)m