A math quiz for adults. Can you solve it?
In this article, we’re showcasing plenty of math quizzes that we want adults to try!
We’ve gathered everything from puzzles you can solve with a flash of insight—but can be tricky if you’re too rigid—to serious problems that have appeared in the Math Olympiad.
They’re perfect for killing time and training your brain.
You can enjoy them with other math-loving adults, or challenge your child to see who can solve them faster—it sounds fun either way.
Give them a try with a game-like mindset!
- [Interesting] Collection of Math Quiz Problems
- Math quiz for elementary school students
- [Brain Training] Difficult Riddles That Even Adults Struggle With
- Fun Quiz Questions That Will Liven Up the Office [2026]
- How many can you solve? Brain-flexing math riddle quiz
- A collection of challenging quizzes for adults [Difficult]
- [Interesting] Collection of Matchstick Quiz Problems
- [Daily Challenge] A Collection of Cipher Quiz Problems to Stimulate the Adult Brain
- [Challenging and Fun!] Quizzes & Riddles for Adults
- [Battle of Wits] Stimulate your intellectual curiosity! Quiz questions that get adults excited
- [Trick Quiz] Quiz Questions That Excite Everyone from Kids to Adults
- [Interesting] A collection of brain teaser quiz questions. Let's train your brain!
- [Satisfying When Solved] Challenging Quizzes Recommended for Elementary School Students!
Math quiz for adults. Can you solve it? (11–20)
A math quiz that tricks 90% of people! Brain-teasing trick questions
I think everyone can do the calculation written on paper, “1 + 2 × 3 =”.
The answer is, yes, 7.
But when this problem is asked orally, people tend to calculate 1 + 2 first and don’t arrive at the correct answer.
Try the “Math Quiz that Tricks 90% of People!” to give your brain a workout.
“The sum of 20Ω and 30Ω in series is 50Ω, but what is it when connected in parallel?” The answer is 12Ω.
Work through it with a laugh, thinking, “I used to be good at arithmetic and science back in the day…”!
There’s a 95% chance a car will pass within 30 minutes! So… what percent will it be within 10 minutes?
When paying at the register, if the total is 970 yen, you might hand over 1,070 yen to get 100 yen in change.
It’s a trick to keep the number of coins in your wallet to a minimum, but apparently only Japanese people do this.
In that sense, are Japanese people good at mental arithmetic? With that in mind, let’s enjoy some “quizzes that people good at math can solve but those weak at math can’t”! There are plenty of problems like that posted online, such as: “If two cylinders have a surface area ratio of 16:9, what is the ratio of their heights?” The “probability of a car passing” problem is particularly well made, so give it a try if you’re interested!
Matchstick Math Quiz
Matchstick calculation puzzles have been around for a long time.
They feel like a mix of real arithmetic and brain teasers, engaging a different part of your mind than usual.
Among those, this quiz is relatively straightforward and might be easier to solve.
Be sure to try various matchstick puzzles and open up your mind!
Surprisingly tough 6th-grade homework! Three total problems that test 3D spatial recognition skills!
We learned about all sorts of 3D shapes in elementary and middle school—triangular prisms, cylinders, cubes, spheres, and so on.
Many of us also struggled with how to find volumes and with cross-sectional diagrams of solids.
If you’re confident with spatial figures, try tackling these “problems that test 3D recognition.” For example: “Seen from above it’s a circle, from the side it’s a triangle… what solid is it?” The answer is a cone.
Or: “Paint the visible faces after lining up five 1-cubic-centimeter cubes in a row; when you take the solid apart, what is the total area of the unpainted faces?” If you were good at math, give the calculation a try!
An arithmetic quiz from La Salle Junior High School’s past entrance exam questions!
This is a problem asking you to find the measure of the red-colored angle in a complexly folded figure.
It may look simple at first glance, but once you’ve been away from math for a while, it can become quite baffling.
The unique shape makes it interesting, and it’s a fun problem that lets you study again.
A smart elementary school student is solving this problem.
This is a problem from the Junior Mathematical Olympiad trial.
Solving it may require not only mathematical knowledge but also some skills like those used in logical puzzles.
Take your time, think it through carefully, and put your mind to work.
Math quiz for adults. Can you solve it? (21–30)
Arithmetic Olympiad problem: “How many horse mackerel are there?”
I can hardly believe this was a problem given to elementary school students—it makes me want to hold my head in my hands—but as an adult, I’d like to somehow use x and y and solve it faster than the kids.
That said, there really are quite a lot of items bought… How long does it take you adults to solve it?