Estimating Square Roots Quiz - CBSE Class 8 Mathematics

Free practice quiz: Estimating Square Roots (CBSE Class 8 Mathematics). 11 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. Which of the following is the closest estimate to √60?

   1. 6
   2. 7
   3. 8
   4. 9
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   Answer: B. 7

   7² = 49 and 8² = 64. Since 60 is closer to 49 than 64, √60 is closer to 7.

2. What is the approximate value of √300?

   1. 15
   2. 17
   3. 18
   4. 20
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   Answer: B. 17

   17² = 289 and 18² = 324. 300 is closer to 289 than 324.

3. Find an approximate value of √780, correct to one significant figure.

   1. 20
   2. 27
   3. 28
   4. 30
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   Answer: C. 28

   28² = 784 which is very close to 780. Therefore, the approximate value correct to one significant figure is 28.

4. Estimate the value of √1500 to the nearest whole number.

   1. 38
   2. 39
   3. 40
   4. 41
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   Answer: B. 39

   38² = 1444 and 39² = 1521. 1500 is closer to 1521 than 1444.

5. Estimate the square root of 2000.

   1. 44
   2. 45
   3. 46
   4. 47
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   Answer: B. 45

   44² = 1936 and 45² = 2025. 2000 is closer to 2025.

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