Grade 8 Preview Assessment

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| By Melmorri
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Melmorri
Community Contributor
Quizzes Created: 1 | Total Attempts: 505
Questions: 5 | Attempts: 506

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8th Grade Quizzes & Trivia

Review for grade 8 math


Questions and Answers
  • 1. 

    1. Which number is not a perfect square?

    • A.

      50

    • B.

      100

    • C.

      169

    • D.

      441

    Correct Answer
    A. 50
    Explanation
    The numbers 100, 169, and 441 are all perfect squares because they can be expressed as the square of an integer (10, 13, and 21 respectively). However, 50 is not a perfect square because there is no integer that can be squared to give 50.

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  • 2. 

    A square has an area of 12 cm2. Its side length is

    • A.

      144 cm

    • B.

      Between 4 cm and 5 cm

    • C.

      Between 1 cm and 2 cm

    • D.

      Between 3 cm and 4 cm

    Correct Answer
    D. Between 3 cm and 4 cm
    Explanation
    The area of a square is calculated by multiplying the length of one side by itself. In this case, the area is given as 12 cm2. To find the side length, we need to take the square root of the area. The square root of 12 is between 3 and 4. Therefore, the side length of the square is between 3 cm and 4 cm.

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  • 3. 

    Which square root cannot be expressed as a whole number?

    • A.

      Square root of 121

    • B.

      Square root of 125

    • C.

      Square root of 225

    • D.

      Square root of 625

    Correct Answer
    B. Square root of 125
    Explanation
    The square root of 125 cannot be expressed as a whole number because there is no integer that, when multiplied by itself, equals 125. The square root of 125 is an irrational number, meaning it cannot be expressed as a fraction or a whole number.

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  • 4. 

    The area of a square drawn on side GH would be     

    • A.

      11 square units

    • B.

      28 square units

    • C.

      65 square units

    • D.

      121 square units

    Correct Answer
    C. 65 square units
  • 5. 

    The unknown side length is approximately

    • A.

      52 cm

    • B.

      484 cm

    • C.

      25.6 cm

    • D.

      48.4 cm

    Correct Answer
    C. 25.6 cm
    Explanation
    The correct answer is 25.6 cm because it is the only option that is a plausible length for an unknown side. The other options, 52 cm, 484 cm, and 48.4 cm, are all too large to be a side length of a typical object. Therefore, 25.6 cm is the most reasonable choice for the unknown side length.

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