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Square roots and cube - Free MCQ Practice Test with solutions, Class 8


MCQ Practice Test & Solutions: Test: Square roots and cube roots (10 Questions)

You can prepare effectively for Class 8 Year 8 Mathematics IGCSE (Cambridge) with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Test: Square roots and cube roots". These 10 questions have been designed by the experts with the latest curriculum of Class 8 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 20 minutes
  • - Number of Questions: 10

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Test: Square roots and cube roots - Question 1

What is the square root of 100?

Detailed Solution: Question 1

The square root of 100 is a number that, when multiplied by itself, equals 100. Both 10 × 10 = 100 and -10 × -10 = 100, so the square roots are 10 and -10.

Test: Square roots and cube roots - Question 2

You are given the two numbers '3 squared' and 'the square root of 100'. How do they relate to each other?

Detailed Solution: Question 2

3 squared is 3 × 3 = 9. The square root of 100, by standard convention, is the principal root, which is 10. Comparing 9 and 10, we find 10 > 9, so the square root of 100 is the larger number.

Test: Square roots and cube roots - Question 3

You are given the two numbers '9 squared' and '81'. How do they relate to each other?

Detailed Solution: Question 3

9 x 9 = 81.

Test: Square roots and cube roots - Question 4

Which of these numbers has a whole number as a square root?

Detailed Solution: Question 4

6 x 6 = 36.

Test: Square roots and cube roots - Question 5

What is the quickest way to find the square root of 8?

Detailed Solution: Question 5

Some square roots are not whole numbers and can be very difficult to work out. The square root of 8 is approximately 2.828427. We used a calculator to find out!

Test: Square roots and cube roots - Question 6

The √ sign is referred to as what?

Detailed Solution: Question 6

The √ symbol is called the "square root" or "radical" symbol, representing the operation to find a number that, when multiplied by itself, equals the given number.

Test: Square roots and cube roots - Question 7

What is the square root of 16?

Detailed Solution: Question 7

The square root of 16 is a number that, when multiplied by itself, equals 16. Both 4 × 4 = 16 and -4 × -4 = 16, so the square roots are 4 and -4.

Test: Square roots and cube roots - Question 8

What is the square root of 64?

Detailed Solution: Question 8

The square root of a number is a value that, when multiplied by itself, gives the original number. Here, √64 = 8 because 8 × 8 = 64.

Test: Square roots and cube roots - Question 9

What is the cube root of 27?

Detailed Solution: Question 9

The cube root of a number is a value that, when multiplied by itself twice, gives the original number. Here, ∛27 = 3 because 3 × 3 × 3 = 27.

Test: Square roots and cube roots - Question 10

Which number is a perfect cube?

Detailed Solution: Question 10

A perfect cube is a number that can be expressed as the cube of an integer. Here, 27 is a perfect cube because ∛27 = 3, which is an integer.

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