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Between which two integers does √13 lie on the number line?

Answer and explanation

Correct answer: 3 and 4

The governing method is comparison with consecutive perfect squares. Since 3^2=9 and 4^2=16, and 9<13<16, taking principal square roots gives 3<√13<4. Hence √13 lies between the integers 3 and 4, so option A is correct. It cannot lie between 2 and 3 because numbers in that interval have squares between 4 and 9, whereas 13 is larger than 9. It cannot lie between 4 and 5 because √13 is less than 4, as 13 is less than 16. A decimal approximation, √13≈3.606, confirms the location but is unnecessary. The comparison method is exact and avoids relying on rounded values or an inaccurate estimate.

Related tags

Square RootPerfect SquaresNumber LineInequalitiesReal NumbersRepresenting Real Numbers On The Number LinePolynomialsMathematics

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