I would do this a lot when I was "doing my homework". I'd have it sitting out in front of me and just be scrolling through FunSubstance or Instagram.
And then if my parents say something like "you should be doing your homework, not surfing the web", I would just say "I'm looking up how to do this problem" or "I can't find some of the answers in the book."
And then if my parents say something like "you should be doing your homework, not surfing the web", I would just say "I'm looking up how to do this problem" or "I can't find some of the answers in the book."