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Deductive reasoning. You know that 10 x 10 is 100 and 20 x 20 is 400, so the square root of 225 is between 10 and 20. Only numbers that end in a five will create a square that ends in a five. 15 x 15 = 225

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10y ago
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Q: How do you find out what the square root 225 is?
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