80 Eighth Grade Trivia Questions & Answers for a Bigger Challenge

Eighth-grade trivia is where I want the questions to get sharper, not just longer.

These 80 questions mix algebra, geometry, chemistry, physics, history, geography, evidence, and digital literacy, ending with a reasoning round that rewards checking the details.

For the host: Use a few rounds at a time, allow scratch paper, and accept equivalent wording when the idea is correct. This is a recreational challenge, not an eighth-grade assessment.

Linear Equations and Functions

1. Solve 4x − 7 = 21.
   Answer: x = 7.
2. What is the slope of y = 3x + 2?
   Answer: 3.
3. In y = −2x + 5, what is the y-intercept?
   Answer: 5.
4. A line rises 6 units while running 3 units right. Slope?
   Answer: 2.
5. Solve 2(x + 4) = 18.
   Answer: x = 5.
6. If y = 4x − 1, what is y when x = 3?
   Answer: 11.
7. What is the solution to x/5 = 7?
   Answer: 35.
8. Which relation assigns exactly one output to each input?
   Answer: A function.
9. What is 2³ × 2²?
   Answer: 32.
10. Write 0.00045 in scientific notation.
    Answer: 4.5 × 10⁻⁴.

Geometry, Transformations, and Data

11. What theorem relates the sides of a right triangle?
    Answer: Pythagorean theorem.
12. Right triangle legs 6 and 8: hypotenuse?
    Answer: 10.
13. A translation changes a figure’s location but does it change size?
    Answer: No.
14. A reflection flips a figure across what?
    Answer: A line of reflection.
15. A 90-degree turn is what transformation?
    Answer: Rotation.
16. Two figures with the same shape and size are called what?
    Answer: Congruent.
17. What is the volume of a cylinder with radius 3 and height 5, in terms of pi?
    Answer: 45π cubic units.
18. What is the mean of 6, 8, 10, and 12?
    Answer: 9.
19. What does a scatter plot show?
    Answer: The relationship between two quantitative variables.
20. Does correlation by itself prove causation?
    Answer: No.

Matter, Atoms, and Reactions

21. What is the smallest unit of an element retaining that element’s properties?
    Answer: An atom.
22. Which particle determines an element’s atomic number?
    Answer: Protons.
23. Atoms of the same element with different neutron counts are called what?
    Answer: Isotopes.
24. What is a substance made of two or more elements chemically bonded?
    Answer: A compound.
25. What is the pH of a neutral aqueous solution near room temperature?
    Answer: About 7.
26. A pH below 7 is generally described as what?
    Answer: Acidic.
27. What law says matter is not created or destroyed in an ordinary chemical reaction?
    Answer: Conservation of mass.
28. What are substances present at the start of a chemical reaction called?
    Answer: Reactants.
29. What are substances formed by a chemical reaction called?
    Answer: Products.
30. What does a catalyst do to reaction rate without being consumed overall?
    Answer: It speeds the reaction by lowering the activation-energy barrier.

Motion, Waves, and Space

31. Speed is distance divided by what?
    Answer: Time.
32. What is a change in velocity over time called?
    Answer: Acceleration.
33. What is Newton’s first law often called?
    Answer: The law of inertia.
34. What is the SI unit of energy?
    Answer: Joule.
35. What kind of wave can travel through a vacuum: sound or light?
    Answer: Light.
36. What property of a wave is the distance between matching points on successive cycles?
    Answer: Wavelength.
37. What is the number of wave cycles passing a point per second called?
    Answer: Frequency.
38. What force keeps planets in orbit around the Sun?
    Answer: Gravity.
39. What galaxy contains the solar system?
    Answer: The Milky Way.
40. Why do we see different lunar phases?
    Answer: We see changing portions of the Moon’s sunlit half as it orbits Earth.

History and Civic Documents

41. What 1776 document declared the American colonies independent?
    Answer: Declaration of Independence.
42. What 1787 document established the U.S. federal framework?
    Answer: U.S. Constitution.
43. What are the first ten constitutional amendments called?
    Answer: Bill of Rights.
44. Which amendment abolished slavery in the United States, except as punishment for crime after conviction?
    Answer: Thirteenth Amendment.
45. Which amendment defined national citizenship and guaranteed equal protection of the laws?
    Answer: Fourteenth Amendment.
46. Which amendment prohibits denying the vote on account of race, color, or previous condition of servitude?
    Answer: Fifteenth Amendment.
47. What conflict was fought in the United States from 1861 to 1865?
    Answer: American Civil War.
48. What 1863 proclamation declared freedom for enslaved people in areas then in rebellion against the United States?
    Answer: Emancipation Proclamation.
49. What do historians call firsthand evidence from the period being studied?
    Answer: A primary source.
50. What is a change or addition to the Constitution called?
    Answer: An amendment.

Geography and Global Connections

51. What line divides the Northern and Southern Hemispheres?
    Answer: Equator.
52. What line is 0 degrees longitude?
    Answer: Prime meridian.
53. Which ocean is largest by surface area?
    Answer: Pacific Ocean.
54. What is the largest desert on Earth overall?
    Answer: Antarctica.
55. What is the largest hot desert?
    Answer: Sahara.
56. What river has the greatest average discharge?
    Answer: Amazon River.
57. What is the movement of goods, people, ideas, and capital across borders often called?
    Answer: Globalization.
58. What is a country’s system of producing, distributing, and consuming goods and services called?
    Answer: Its economy.
59. What is a tax placed on imported goods called?
    Answer: A tariff.
60. What term describes people moving from rural areas into cities?
    Answer: Urbanization.

Language, Evidence, and Digital Literacy

61. What is a writer’s main arguable position called?
    Answer: A claim or thesis.
62. What is evidence from a text quoted word-for-word called?
    Answer: A direct quotation.
63. What does paraphrasing mean?
    Answer: Restating information in your own words while preserving its meaning.
64. What is plagiarism?
    Answer: Presenting another person’s words or ideas as your own without appropriate credit.
65. What is a source created by someone who directly experienced an event called?
    Answer: A primary source.
66. What is a later analysis based on primary sources called?
    Answer: A secondary source.
67. What is the web address of a page called?
    Answer: A URL.
68. What does HTTPS indicate about data sent between browser and site?
    Answer: The connection uses encryption; it does not by itself prove the site’s claims are trustworthy.
69. Why compare multiple reliable sources for an important claim?
    Answer: To corroborate information and identify disagreement or missing context.
70. What is an algorithm?
    Answer: A defined sequence of steps for solving a problem or completing a task.

Reasoning Challenge

71. A $75 item is discounted 20%, then 10% of the discounted price. Final price?
    Answer: $54.
72. A line passes through (2,5) and (6,13). Slope?
    Answer: 2.
73. A right triangle has hypotenuse 13 and one leg 5. Other leg?
    Answer: 12.
74. A population rises from 400 to 500. Percent increase?
    Answer: 25%.
75. A fair coin is flipped twice. Probability of two heads?
    Answer: ¼.
76. A sample surveys only basketball players about the school’s favorite sport. Main problem?
    Answer: Sampling bias.
77. Two variables rise together in a scatter plot. What can you conclude without more evidence?
    Answer: They are associated; you cannot conclude one causes the other.
78. A claim cites a study but omits sample size and method. What information should you seek?
    Answer: The study design, sample, methods, and original source.
79. A headline reports a 100% increase from 1 case to 2. Why can the starting value matter?
    Answer: Relative change can sound large when the absolute change is small.
80. Two credible sources disagree. What should you compare?
    Answer: Their evidence, methods, definitions, dates, and scope.

How to Use These Questions

Mix a calculation round with science, history, or language so one strength does not decide the whole game. For a harder version, ask for the reasoning after the answer; for easier play, offer two plausible choices.

References and Answer Notes

The questions are written around durable concepts rather than changing popularity rankings. History questions name the specific document or event, and science questions distinguish models and definitions that are often blurred in casual trivia.

Please report a correction with the question number when an answer or wording needs attention.

Keep Going

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About this quiz

Site editor: Ellie Simons. Read our Trivia Methodology to learn how questions are researched and updated. Page last updated: September 26, 2026. Report an error.