"The Math Workbook for Kids: Addition and Subtraction" is an interactive book that children can learn and practice addition and subtraction with numbers between 0 to 39. (See the screenshots)
How to use this book:
1. Open the book
2. Show children a page
3. Let children think about the question
4. Let children touch a number on color
The design of this book helps children to focus on what they see (flashcard style) and allows them to learn addition and subtraction effectively. Download the sample book first and find out how it works"