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Which statement is correct when comparing \(\sqrt{399}\) and \(\sqrt{401}\) in a square root spiral?

Answer and explanation

Correct answer: \(\sqrt{399}\) lies between 19 and 20, while \(\sqrt{401}\) lies between 20 and 21.

Since \(19^2=361\), \(20^2=400\), and \(21^2=441\), \(361<399<400\) gives \(19<\sqrt{399}<20\). Similarly, \(400<401<441\) gives \(20<\sqrt{401}<21\). Options B and C are incorrect because the numbers lie on opposite sides of 400, so their square roots lie on opposite sides of 20. Exam tip: Compare a number with the nearest perfect squares to locate its square root.

Related tags

Number SystemsSquare RootsSquare Root SpiralComparisonPerfect SquaresMathematicsClass 9 Mcq

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