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Which decimal value is closest to √63 on the number line?

Answer and explanation

Correct answer: 7.94

The governing concept is estimating an irrational square root by locating it between consecutive perfect squares and comparing decimal approximations. Since 7² = 49 and 8² = 64, √63 lies between 7 and 8 and must be very close to 8. Testing the nearest plausible option, 7.94² = 63.0436, whose difference from 63 is only 0.0436. More accurately, √63 is approximately 7.937253, which rounds to 7.94. Therefore option A is the closest decimal value. Option B, 7.50, is substantially below the root; option C, 8.20, is above 8 and therefore farther away; and option D, 6.90, is even outside the interval from 7 to 8. Thus the number-line position confirms A.

Related tags

Number-LineEstimationSquare-RootsIrrational-NumbersRepresenting Real Numbers On The Number LinePolynomialsMathematicsClass 10 Mcq

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