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Home › Grade8 › OLYMPIAD › Math Olympiad-Grade-8 › Square Roots & Cube Roots › Square Roots and Cube Roots Worksheet-6

Square Roots and Cube Roots Worksheet-6

Square Roots and Cube Roots Worksheet-6

 

  1. If , then the value of is:

(a) 0.6122         (b) 0.8163         (c) 1.223            (d) 1.2245

 

  1. If , then the value of is equal to:

(a) 5.59              (b) 7.826           (c) 8.944            (d) 10.062

 

  1. If 2*3 = and 3*4 = 5, then the value of 5*12 is:

(a)               (b)              (c) 12                  (d) 13

 

  1. The least perfect square number divisible by 3, 4, 5, 6 and 8 is:

(a) 900               (b) 1200             (c) 2500             (d) 3600

 

  1. The least perfect square, which is divisible by each of 21, 36 and 66, is:

(a) 213444         (b) 214344        (c) 214434         (d) 231444

 

  1. The least number by which 294 must be multiplied to make it a perfect square, is:

(a) 2                    (b) 3                    (c) 6                    (d) 24

 

  1. Find the smallest number by which 5808 should be multiplied so that the product becomes a perfect square.

(a) 2                    (b) 3                    (c) 7                    (d) 11

 

  1. The least number by which 1470 must be divided to get a number which is a perfect square, is:

(a) 5                    (b) 6                    (c) 15                   (d) 30

 

  1. What is the smallest number to be subtracted from 549162 in order to make it a perfect square?

(a) 28                 (b) 36                 (c) 62                  (d) 81

 

  1. What is the least number which should be subtracted from 0.000326 to make it a perfect square?

(a) 0.000002                                (b) 0.000004

(c) 0.02                                           (d) 0.04

 

  1. The smallest number added to 680621 to make the sum a perfect square is:

(a) 4                    (b) 5                    (c) 6                    (d) 8

 

  1. The greatest four–digit perfect square number is:

(a) 9000            (b) 9801             (c) 9900             (d) 9981

 

  1. The least number of 4 digits which is a perfect square, is:

(a) 1000             (b) 1016              (c) 1024             (d) 1036

 

  1. Given , then is equal to:

(a) 1.98              (b) 1.984            (c) 1.9841          (d) 2

 

  1. is equal to:

(a) 0                    (b)                   (c) 1                     (d) 5

 

Answer Key:

(1)-d; (2)-b; (3)-d; (4)-d; (5)-a; (6)-c; (7)-b; (8)-d; (9)-d; (10)-a; (11)-a; (12)-b; (13)-c; (14)-c; (15)-d