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There is an app for iPads-World Book eBook. If you are on the generic log in you can not save your place in the e-books. To create an account you would go to the e-books icon and click the profile picture in the right top corner and create an account.
You can download ebooks to a device-then you can view without internet- nice for when students want books for vacation.
In ebooks- search building blocks (nonfiction graphic novels) There are some great ones for learning subtraction or understanding math concepts.
WorldBookOnline.com/training- Training links for each section of World Book
Different Sections of World Book Website...
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