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Math Quiz Questions

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21 questions · Updated July 2026

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  1. 1. What is 7 x 8?

    1. 56
    2. 54
    3. 52
    4. 58
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    Correct answer: 56

    Explanation: 7 multiplied by 8 equals 56.

  2. 2. What is the opposite of 'hot'?

    1. Cold
    2. Freezing
    3. Warm
    4. Cool
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    Correct answer: Cold

    Explanation: The opposite of hot is cold.

  3. 3. What is the square root of 144?

    1. 12
    2. 10
    3. 16
    4. 14
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    Correct answer: 12

    Explanation: The square root of 144 is 12.

  4. 4. The three interior angles of any triangle always add up to how many degrees?

    1. 90
    2. 270
    3. 180
    4. 360
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    Correct answer: 180

    Explanation: In flat (Euclidean) geometry, the interior angles of every triangle sum to exactly 180 degrees, no matter the triangle's shape or size.

  5. 5. You buy 3 snacks priced at $2.99 each. What is the total?

    1. $8.87
    2. $8.97
    3. $8.99
    4. $9.07
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    Correct answer: $8.97

    Explanation: Treat $2.99 as $3 minus one cent: 3 x $3 = $9, then subtract 3 cents to get $8.97. Rounding first is a classic mental math trick.

  6. 6. A right angle measures exactly 100 degrees.

    1. True
    2. False
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    Correct answer: False

    Explanation: False. A right angle measures 90 degrees, which is a quarter of a full 360-degree turn. It is the angle you see in the corner of a square.

  7. 7. What is the name of the famous mathematical constant, roughly 3.14159, that links a circle's circumference to its diameter?

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    Answer: Pi

    Explanation: Pi is the ratio of any circle's circumference to its diameter. It is irrational, meaning its decimal expansion never ends and never repeats.

  8. 8. Quick mental math: what is 15% of 200?

    1. 30
    2. 15
    3. 35
    4. 25
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    Correct answer: 30

    Explanation: 10% of 200 is 20 and 5% is 10, so 15% is 20 + 10 = 30. Splitting percentages into 10% and 5% chunks makes mental math much faster.

  9. 9. Which ancient mathematician supposedly leapt from his bath and ran through the streets shouting 'Eureka!'?

    1. Euclid
    2. Archimedes
    3. Pythagoras
    4. Thales
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    Correct answer: Archimedes

    Explanation: Archimedes of Syracuse is said to have realized in the bath how to measure the volume of an irregular object by water displacement, prompting the famous 'Eureka!' ('I have found it!').

  10. 10. No calculator allowed: what is 9 squared minus 9?

    1. 70
    2. 72
    3. 63
    4. 81
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    Correct answer: 72

    Explanation: 9 squared is 81, and 81 - 9 = 72. A neat shortcut: 9 squared minus 9 is the same as 9 x 8.

  11. 11. What is the largest prime number less than 100?

    1. 93
    2. 97
    3. 99
    4. 95
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    Correct answer: 97

    Explanation: 97 is the largest prime number less than 100.

  12. 12. What is the speed of light in a vacuum?

    1. 200,000,000 m/s
    2. 250,000,000 m/s
    3. 299,792,458 m/s
    4. 300,000,000 m/s
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    Correct answer: 299,792,458 m/s

    Explanation: The speed of light in a vacuum is approximately 299,792,458 meters per second.

  13. 13. What is the solution to the equation 2x + 3 = 11?

    1. 8
    2. 5
    3. 3
    4. 4
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    Correct answer: 4

    Explanation: To solve for x, subtract 3 from both sides to get 2x = 8, then divide by 2 to find x = 4. Understanding how to manipulate equations is fundamental in algebra.

  14. 14. What is the next prime number after 31?

    1. 39
    2. 35
    3. 33
    4. 37
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    Correct answer: 37

    Explanation: 33 is 3 x 11 and 35 is 5 x 7, so neither is prime. The next number with no divisors other than 1 and itself is 37.

  15. 15. How many sides does a heptagon have?

    1. 8
    2. 7
    3. 9
    4. 6
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    Correct answer: 7

    Explanation: A heptagon has 7 sides; the prefix 'hepta-' is Greek for seven. The classic mix-up is with the hexagon, which has 6, and the octagon, which has 8.

  16. 16. The number 1 is a prime number.

    1. True
    2. False
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    Correct answer: False

    Explanation: False. A prime number must have exactly two distinct divisors, 1 and itself, but the number 1 has only one divisor. Mathematicians exclude it partly so that every number has a unique prime factorization.

  17. 17. A 'gross' is an old trading term meaning a dozen dozen. How many items is that?

    1. 124
    2. 100
    3. 120
    4. 144
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    Correct answer: 144

    Explanation: A dozen is 12, so a dozen dozen is 12 x 12 = 144. Eggs, pencils, and buttons were traditionally sold by the gross.

  18. 18. Zero is an even number.

    1. False
    2. True
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    Correct answer: True

    Explanation: True. An even number is any integer divisible by 2 with no remainder, and 0 divided by 2 is exactly 0. Zero also sits between two odd numbers (-1 and 1), just like every other even number.

  19. 19. There are more possible games of chess than there are _____ in the observable universe.

    1. stars
    2. galaxies
    3. planets
    4. atoms
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    Correct answer: atoms

    Explanation: Interesting right!? The Shannon Number estimates 10^120 possible chess games, while there are "only" about 10^80 atoms in the observable universe.

  20. 20. Which number is famously known as the 'taxicab number' from a hospital chat between mathematicians Hardy and Ramanujan?

    1. 1001
    2. 1234
    3. 1729
    4. 2520
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    Correct answer: 1729

    Explanation: Hardy called his taxi's number, 1729, 'rather dull'. Ramanujan instantly replied that it is the smallest number expressible as the sum of two cubes in two different ways: 1729 = 1^3 + 12^3 = 9^3 + 10^3.

  21. 21. Who proved Fermat's Last Theorem by publishing a complete proof in 1995?

    1. Sophie Germain
    2. Andrew Wiles
    3. Pierre de Fermat
    4. Carl Friedrich Gauss
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    Correct answer: Andrew Wiles

    Explanation: Andrew Wiles announced a proof in the early 1990s and, after fixing an error (with assistance from Richard Taylor), published a complete corrected proof in 1995.

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Salim has experience in content marketing, growth marketing, product marketing, online forms, and building viral quizzes. Salim founded Quiz Questions Org (QQO, in short) in 2025. Ever curious, he loves researching different topics and areas to turn them into quizzes. Salim has a lifelong passion for cycling and traveling.

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