The square root of 9 is 3. You can think of square root by 2 numbers multiplied by each other. For example, 3 times 3 equals 9, so that means the square root of 9 is 3. Another example would be 25. 5 times 5 equals 25, so the square root of 25 is 5.
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Division in math is kind of like backwards multiplication. For example, 10 divided by 5 is 2, because 5 times 2 is 10.
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Hope that helps!