Answers to fourth grade questions can be found at ProProfs.com and K5Learning.com. Profprofs.com features questions and answers pertaining to a wide range of fourth grade subjects that include geography, science and math as well as general knowledge.
Each quiz on ProProfs.com consist of questions in a multiple choice format with links to related quizzes and topics.
K5Learning.com is an online reading and math program that offers fourth grade worksheets and workbooks. Each workbook contains instructions and exercises with answer keys designed for parent-led independent study. This site hosts over 3,000 online tutorials and activities that students can use to learn at their own paces and levels.