image of young student using ipad
Using iPads for centers work is a great option.  
Here are some techniques that can help younger students stay on task, and access only the materials you intend.
Enable Restrictions on each iPad to limit access to certain apps, functions or websites.
In the video below - you will learn how to:
      Limit the websites available to your students
      Create an iPad website icon 
      Organize icons on the desktop for easy access 
iPad Restrictions (9 min) 
Guided Access 
Guided Access allows you to limit iPad access
to a single app - or certain areas of the screen
when using a browser app. 
In the video below - you will learn how to:
   Set-up Guided Access
   Create the proper access code
   Turn-on Guided Access within an app
   Adjust settings within Guided Access
   Turn-off Guided Access after the student-use session 
Guided Access (7:42 min)