IQ Test For 8th Graders: Check Your Kids IQ

Reviewed by Janaisa Harris
Janaisa Harris, BA (Mathematics) |
High School Math Teacher
Review Board Member
Janaisa Harris, an experienced educator, has devoted 4 years to teaching high school math and 6 years to tutoring. She holds a bachelor's degree in Mathematics (Secondary Education, and Teaching) from the University of North Carolina at Greensboro and is currently employed at Wilson County School (NC) as a mathematics teacher.
 , BA (Mathematics)
By Thames
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Thames
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  • 1/20 Questions

    What number must be subtracted from 7 to get -7?

    • -14
    • 7
    • 1
    • 14
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About This Quiz

Curious about your child's intellectual potential? Our IQ test 8th grade edition is designed to challenge young minds with logic, math, and reasoning questions. This engaging assessment helps assess cognitive skills while making learning fun. No matter if your child excels in problem-solving or needs a confidence boost, this test offers valuable insights into their strengths.

Taking an IQ test for 8th graders can be a great way to track academic progress and identify areas for improvement. This quiz enhances critical thinking and mental agility. It’s not just about scores—it’s about understanding potential! Give your child the opportunity to shine and see where they stand among their peers. Let’s get started!

IQ Test For 8th Graders: Check Your Kids IQ - Quiz

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  • 2. 

    What is -1 times -2 times -3 times -4?

    • -12

    • 12

    • -24

    • 24

    Correct Answer
    A. 24
    Explanation
    When multiplying negative numbers together, the product follows the rules of multiplication, but the result will be positive if there is an even number of negative factors and negative if there is an odd number of negative factors.
    In this case, you have four negative numbers:
    -1 * -2 * -3 * -4
    Since there are four negative numbers, an even number, the product will be positive.
    Now, let's calculate the product:
    (-1) * (-2) * (-3) * (-4) = 24
    So, -1 times -2 times -3 times -4 equals 24.

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  • 3. 

    What is the length of a line segment with endpoints at (1, 3) and (4, 3)?

    • 1 Unit

    • 2 Units

    • 3 Units

    • 4 Units

    Correct Answer
    A. 3 Units
  • 4. 

    How many sides does a trapezoid have?

    • 5

    • 6

    • 3

    • 4

    Correct Answer
    A. 4
    Explanation
    The correct answer is 4. A trapezoid is a quadrilateral, which means it has four sides. One pair of opposite sides in a trapezoid is parallel, distinguishing it from other quadrilaterals. Additionally, a trapezoid has two non-parallel sides of different lengths. This unique characteristic allows for various properties and calculations to be determined within the shape. Knowing that a trapezoid has four sides is essential for understanding its geometric properties and how it differs from other shapes.

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  • 5. 

    What is the complement of a 16 degree angle?

    • 64 Degrees

    • 54 Degrees

    • 74 Degrees

    • 84 Degrees

    Correct Answer
    A. 74 Degrees
  • 6. 

    What is 37 degrees Celsius in Fahrenheit?

    • 98.6 Degrees

    • 100 Degrees

    • 65 Degrees

    • 37 Degrees

    Correct Answer
    A. 98.6 Degrees
  • 7. 

    What is 10 degrees Celsius in Fahrenheit?

    • 16 Degrees

    • 50 Degrees

    • 34 Degrees

    • 76 Degrees

    Correct Answer
    A. 50 Degrees
  • 8. 

    How many seconds are in 26.9 minutes?

    • 16140

    • 2690

    • 1614

    • 269

    Correct Answer
    A. 1614
  • 9. 

    What is the supplement of a 176 degree angle?

    • 24 Degrees

    • 14 Degrees

    • -4 Degrees

    • 4 Degrees

    Correct Answer
    A. 4 Degrees
  • 10. 

    What is (3a + b)/2c if a = 3, b = 2 and c = 5?

    • 2.2

    • 2.4

    • 1.1

    • 3.3

    Correct Answer
    A. 1.1
  • 11. 

    What is the absolute value of -3 - 2?

    • 4

    • 1

    • 5

    • 3

    Correct Answer
    A. 5
    Explanation
    The absolute value of a number is its distance from zero on the number line, regardless of direction. To find the absolute value of -3 - 2, you first need to evaluate the expression inside the absolute value brackets:
    |-3 - 2| = |-5|
    Now, since -5 is 5 units away from zero on the number line, the absolute value is 5.
    Therefore, the absolute value of -3 - 2 is 5.

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  • 12. 

    What is true about vertical angles?

    • They are always congruent. 

    • They are always 90 degrees. 

    • They are always supplementary. 

    • They are always complementary.

    Correct Answer
    A. They are always congruent. 
    Explanation
    Vertical angles are formed when two lines intersect. They are the angles that are opposite each other, and they always have the same measure (meaning they are congruent). The other options are incorrect because vertical angles don't have to be 90 degrees (that's only if the lines are perpendicular), and they don't add up to 90 or 180 degrees unless the lines are perpendicular.  Sources and related content

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  • 13. 

    What is the complement of a 76 degree angle?

    • 14 Degrees

    • 104 Degrees

    • 16 Degrees

    • 24 Degrees

    Correct Answer
    A. 14 Degrees
  • 14. 

     If 721 out of 950 people like basketball, how many of 10,000 should like basketball (rounded)?

    • 7700

    • 7500

    • 7589

    • 7210

    Correct Answer
    A. 7589
  • 15. 

    What value of x makes "8 + x = 0.8" a true statement?

    • -7.2

    • -8.800000000000001

    • 7.2

    • 8.800000000000001

    Correct Answer
    A. -7.2
  • 16. 

    If f(x) = 2x - 3, what is f(-3)?

    • -9

    • 9

    • 3

    • -3

    Correct Answer
    A. -9
  • 17. 

    How many cc's are in 15 mL?

    • 0.15 cc

    • 150 cc

    • 15 cc

    • 1.5 cc

    Correct Answer
    A. 15 cc
  • 18. 

    There are two children in a family, what is the probability that both are girls?

    • 25 percent

    • 40 percent

    • 75 percent

    • 100 percent

    Correct Answer
    A. 25 percent
  • 19. 

    What is 5 degrees Celsius in Fahrenheit?

    • 21 Degrees

    • 45 Degrees

    • 41 Degrees

    • 37 Degrees

    Correct Answer
    A. 41 Degrees
  • 20. 

    How many milliliters are in one cubic centimeters?

    • 1/2 Milliliter

    • 1 Milliliter

    • 2 Milliliters

    • 10 Milliliters

    Correct Answer
    A. 1 Milliliter
    Explanation
    One cubic centimeter is equal to one milliliter. This is because the volume of a cube with sides measuring one centimeter is equal to one cubic centimeter, and since one milliliter is equivalent to one cubic centimeter, the answer is 1 milliliter. Therefore, there are 1 milliliter in one cubic centimeter. This conversion is commonly used in the measurement of liquids. This conversion is particularly useful in the field of chemistry for accurately measuring and calculating volumes of liquids. It simplifies calculations and ensures precision in scientific experiments and formulations. 

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Janaisa Harris |BA (Mathematics) |
High School Math Teacher
Janaisa Harris, an experienced educator, has devoted 4 years to teaching high school math and 6 years to tutoring. She holds a bachelor's degree in Mathematics (Secondary Education, and Teaching) from the University of North Carolina at Greensboro and is currently employed at Wilson County School (NC) as a mathematics teacher.

Quiz Review Timeline (Updated): Jan 31, 2025 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Jan 31, 2025
    Quiz Edited by
    ProProfs Editorial Team

    Expert Reviewed by
    Janaisa Harris
  • May 14, 2015
    Quiz Created by
    Thames
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