Key & Textbook Maths 9 PTB is an application that provides a complete and comprehensive solution manual for students who are taking Mathematics class 9. The app can be downloaded on the Android platform for free and works offline. The app has been developed in such a way that it can be easily understood and utilized by the user. The solution manual contains all the important concepts and formulas of mathematics. The app is very easy to use and navigate. The user will be able to get all the information from the application in a very easy and simple manner. The app contains all the topics with easy navigation between the topics. The user can also mark the topics that are difficult for him/her and can also be utilized for the same. All the topics are categorized in a way that makes it very easy for the user to get all the information in a simple manner.