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? (21–30)
Rule-Filling Quiz
The problem is: “16→23→28→38→49→62→70→?”.
Think of the number that goes in the question mark and give your answer.
To figure it out, you need to identify the rule from these seven numbers that increase little by little.
While they all increase, the increments vary: sometimes it goes up by 7, other times only by 5.
However, if you look closely, there’s a certain rule in how it increases…
The hint is to consider the ones and tens digits separately.
Now, can you uncover the rule?
A math quiz with answers that can vary
What’s the answer to “9×9÷9×9”? The result changes depending on the order of operations.
How do you think it should be calculated correctly? Elementary school kids who are learning this in real time might come up with the answer right away.
But adults might find themselves thinking, “Huh? Where do I start the calculation?” Should you go from left to right, or do the multiplications first? Please think it through and try to find the answer.
Problems that look simple like this can really make you overthink, can’t they?
Four-digit addition anyone can do
Even calculations that seem difficult at first glance can sometimes be solved quickly if you know the trick.
Apparently, you can get the answer just by adding the third and fourth numbers out of the six lines.
This puzzle can even be used for magic tricks, so be sure to check it out and try it yourself.
Numbers may seem simple, but they’re surprisingly deep…
An arithmetic problem that elementary school students can solve but adults cannot
In fact, these are arithmetic problems from junior high school entrance exams that elementary school students are expected to solve.
They’re the kind of tough questions that make you want to say, “Are these really for elementary school kids?” They really get your brain working and make for great mental training, so let’s do our best to figure out the answers.
[Arithmetic Olympiad Super-Challenge] What is the perimeter of the rectangle?
![[Arithmetic Olympiad Super-Challenge] What is the perimeter of the rectangle?](https://i.ytimg.com/vi/AzAGNc7T9j4/sddefault.jpg)
At first glance, the perimeter here looks difficult to figure out, but since the light green shape inside is a square, you can easily find the answer by setting up an equation: let the side length of the square be ○, let the part obtained by subtracting the square’s side from 12 cm be □, and the part obtained by subtracting the square’s side from 9 cm be △.
For problems that seem hard, it’s a good idea to try replacing numbers with symbols and see if you can simplify your approach.
Give it a try!
Basic problems that we tend to forget surprisingly often
As the level of arithmetic and mathematics rises, things become more complex, and it’s easy to forget the basics.
These are problems designed to review the fundamentals related to arithmetic and mathematics, helping you recall what you’ve learned while connecting it to future applications.
Many of the questions focus on terms that appear in mathematics, and the less frequently a term is used in later fields, the more likely it is to be forgotten.
Let’s revisit what each term represents and in what situations it is used, reflect on what we’ve learned so far, and deepen our interest in mathematics.
Kanji Calculation Quiz
This kanji calculation quiz requires both arithmetic skills and knowledge of kanji.
This particular problem is on the easier side, but it seems fun to try various calculations that follow this rule.
A composite problem like this is likely to stimulate different parts of the brain, so it should be very helpful for keeping your mind active.
Give it a try!