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Feel free to copy and paste my rewrite of these 2 r/ELI5 posts. By user cambridge_ms, 2013 Nov 15 When you multiply a number by itself a few times, you can express that number in terms of an exponent. The exponent is a little number to the upper right of the number that says, "this is how many times the number has been multiplied by itself". So, $2 \times ...


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Not sure how to answer the question apart from suggesting a book about mathematical proof that can be found free online, and that is on the easier side of understanding. It's actually been adopted by a lot of universities and so I'm certain it is a quality textbook. https://www.people.vcu.edu/~rhammack/BookOfProof/ I don't know if it's for kids or grade ...


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