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A student places \(\sqrt{7}\) between 2 and 3 on the number line and says that it is closer to 3 because 7 is closer to 9 than to 4. What is the correct evaluation of the student's conclusion?

Answer and explanation

Correct answer: The student's conclusion is correct; \(\sqrt{7}\) lies between 2 and 3 and is closer to 3.

Since \(2^2=4\) and \(3^2=9\), \(\sqrt{7}\) lies between 2 and 3. Also, \(\sqrt{7}\approx2.646\), so its distance from 3 is about 0.354, less than 0.646 from 2. Thus option B is wrong. Exam tip: compare nearby perfect squares first.

Related tags

Number LineIrrational NumbersSquare RootsEstimationNumber SystemsClass 9 MathematicsMathematicsClass 9 Mcq

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