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Deductive reasoning, trial and error. The square root of 78 will be between 8 and 9, closer to 9.

8.7 squared = 75.7

8.8 squared = 77.4

8.9 squared = 79.2

8.8 is the closest without going over.

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Q: How do you solve the square root of 78 to one decimal place?
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