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Quizzes > Mathematics

Stupid Math Questions Quiz

Quick, free quiz to sharpen basic arithmetic and spot math trick questions. Instant results.

Editorial: Review CompletedCreated By: Jacob MontgomeryUpdated Aug 24, 2025
Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art illustration for a silly math questions quiz on a coral background

This quiz helps you tackle stupid math questions, spot trick wording, and use basic arithmetic with confidence and avoid common traps. If you want more practice, try a mental math test for speed, dive into a hard algebra quiz, or play a quick weakest link math quiz.

How many times can you subtract 5 from 25?
Ten times
Twice
Once
Five times
Once you subtract 5 from 25 the first time, you no longer have 25 - you have 20. Thus, further subtractions are no longer from 25. This is a classic trick question about changing the original value. For more details, see .
If there are 3 apples and you take away 2, how many do you have?
1
5
3
2
When you take away 2 apples, those are the ones you have in your hand - so you have 2. It's a question about interpreting 'you have.' This simple word play appears often in brain teasers. Learn more at .
If six children eat six sandwiches in six minutes, how many minutes will 60 children take to eat 60 sandwiches?
60 minutes
6 minutes
10 minutes
600 minutes
Each child eats one sandwich in six minutes, so 60 children each eat one sandwich in six minutes - still six minutes total. It's a rate problem illustrating that more workers on one units each does not change time. See for similar puzzles.
What is 0 divided by any nonzero number?
1
Infinity
Undefined
0
Zero divided by any nonzero number is always zero because you have zero parts to distribute. This follows the basic property of division in arithmetic. It only becomes undefined when you divide by zero. More at .
If you multiply this number by any other number, the product is always the same. Which number is it?
Infinity
-1
0
1
Multiplying zero by any number yields zero, so the product never changes from zero. This property is unique to zero. One is called the multiplicative identity, but 1×n=n, which changes except for n=1. See .
You buy a shirt for $97, then realize there's a 5% discount. How much do you pay?
$92.15
$5.00
$102.85
$92.00
A 5% discount on $97 is $97×0.05=$4.85. Subtracting gives $97?$4.85=$92.15. You always multiply the original price by the discount rate, then subtract. More on percentage discounts at .
In a 5×5 magic square containing numbers 1 to 25, what is the magic constant (sum of each row, column or diagonal)?
50
60
65
75
The formula for a magic square constant is n(n²+1)/2. For n=5, that's 5×(25+1)/2=5×26/2=65. Every row, column, and diagonal sums to this number. For more, see .
What is the sum of the sequence 1 ? 1 + 1 ? 1 + … up to 100 terms?
1
50
0
-1
With an even number of terms, the pairs (1?1) each sum to zero, so 100 terms give 50 zeroes, totaling 0. If the sequence had an odd number of terms, it'd be 1. This is a simple alternating series property. See .
A bat and ball cost $1.10 in total. The bat costs $1 more than the ball. How much does the ball cost?
$0.15
$0.05
$0.10
$0.06
Let the ball cost x. Then the bat costs x+$1, so x+(x+1)=1.10 ? 2x+1=1.10 ? 2x=0.10 ? x=0.05. It's a classic cognitive reflection test question. More at .
Three ants are each placed at the corners of an equilateral triangle. Each ant randomly picks a direction along an edge to crawl. What is the probability that no two ants collide?
3/4
1/4
1/2
1/8
Ants won't collide only if all three go clockwise or all three go counterclockwise. Each ant has two choices, so 2³=8 total. Only 2 sequences avoid collision, giving 2/8=1/4. For more, see .
If x + 1/x = 4, what is x³ + 1/x³?
52
28
16
76
Cube both sides: (x+1/x)³ = x³+3x+3(1/x)+1/x³ = x³+1/x³+3(x+1/x). Given x+1/x=4, so left is 64 and subtract 3*4=12, leaving 52. See for details.
0
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Study Outcomes

  1. Understand the structure of stupid math questions -

    Learn to distinguish playful phrasing from mathematical operations in these quirky puzzles.

  2. Solve dumb math questions with confidence -

    Apply basic arithmetic and logical reasoning to crack even the silliest of problems.

  3. Recognize patterns in silly maths questions -

    Identify recurring tricks and shortcuts to speed up your problem-solving process.

  4. Apply creative strategies to silly math questions -

    Use lateral thinking and unconventional approaches for unexpected math funny questions and answers.

  5. Enhance mental agility under lighthearted challenges -

    Improve your calculation speed and accuracy while enjoying amusing dumb math questions.

Cheat Sheet

  1. Commutative & Associative Laws -

    Understanding that a + b = b + a and (a + b) + c = a + (b + c) empowers you to rearrange terms in silly maths questions for quick simplification. A simple mnemonic - "Move & Group Freely" - draws on principles from MIT OpenCourseWare to remind you these operations don't change the result.

  2. Order of Operations (PEMDAS) -

    Mastering Parentheses, Exponents, Multiplication/Division, Addition/Subtraction ensures you never get tripped up by "stupid math questions" that hide tricky sequencing. Remember the phrase "Please Excuse My Dear Aunt Sally," endorsed by the Khan Academy, to keep every step perfectly in line.

  3. Inverse Operations for Equations -

    Solving ax + b = c relies on using inverse operations - subtract b then divide by a - to isolate x, a technique backed by University of Cambridge algebra resources. Practicing problems like 3x + 5 = 20 repeatedly builds confidence for even the dumb math questions that look confusing at first blush.

  4. Perfect Squares & Square Roots -

    Memorizing squares up to 15² and their roots helps you breeze through silly math puzzles about areas and diagonal lengths. The table from Stanford's pre-college program is a great reference - knowing 12² = 144 offhand saves time and prevents brain-fog on quiz day.

  5. Divisibility Rules -

    Quick checks for 2, 3, 5, 9, and 11 - such as summing digits for 3 and 9 - turn clunky number-testing in dumb math questions into a fast mental game. The University of Oxford's math outreach materials suggest practicing with random six-digit numbers to make these rules second nature.

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