Math Riddles


What three positive numbers give the same result when multiplied and added together?

1, 2, 3.


If you multiply me by any other number, the answer will always remain the same. What number am I?



I am an odd number. Take away one letter, and I become even. What number am I?



If I have it, I don’t share it. If I share it, I don’t have it. What is it?

A secret.


What comes once in a minute, twice in a moment, but never in a thousand years?

The letter M.


What five-digit number, when multiplied by the number 4, is the same number with the digits in reverse order?



Two fathers and two sons are in a car, yet there are only three people in the car. How?

They are a grandfather, father, and son.


How many 9’s are there between 1 and 100?



Add me to myself and multiply by 4. Divide me by 8 and you will have me once more. What number am I?

Any number.


How many times can you subtract 10 from 100?

Once. After that, you would be subtracting 10 from 90.


A man is twice as old as his little sister. He is also half as old as their dad. Over a period of 50 years, the age of the sister will become half of their dad’s age. What are the present ages of the sister, brother, and their dad?

Sister is 20, the man is 40, and their dad is 80 years old.


What is the largest product that can result from multiplying any two different positive digits?

9 x 8 = 72.


I am a three-digit number. My tens digit is five more than my ones digit, and my hundreds digit is eight less than my tens digit. What number am I?



You see a house with two doors. One door leads to certain death and the other door leads to freedom. There are two guards, one in front of each door. One guard always tells the truth, the other always lies. You do not know which guard is which, nor which door leads to freedom. You can ask only one question to one of the guards. What should you ask to find the door that leads to freedom?

You ask one guard, “If I were to ask the other guard which door leads to freedom, what would he say?” Then choose the opposite door of what the guard points you to.


What is the number that is one half of one quarter of one tenth of 400?



What three numbers, none of which is zero, give the same answer whether they’re added or multiplied?

1, 2, and 3.


A bat and a ball cost $1.10 in total. The bat costs $1.00 more than the ball. How much does the ball cost?

The ball costs $0.05 and the bat costs $1.05.


There is a number that is 5 times the sum of its digits. What is this number?



What number do you get when you multiply all of the numbers on a telephone’s number pad?



Can you arrange four nines to make it equal to 100?

99 + 9/9 = 100.

Math Riddles: A Brain-Boosting Exercise

Math riddles, a unique intersection of mathematics and language, offer an intriguing way to engage with numbers and mathematical concepts. They combine the logical reasoning required in math with the lateral thinking required in problem-solving and the creative interpretation needed for language and humor. Essentially, math riddles provide an excellent mental workout, sharpening both our numerical and linguistic skills.

Click here for an overview of all our riddles.

To the categories

Why Math Riddles Are Good for Your Brain

Engaging in math riddles is akin to performing mental gymnastics. They compel us to utilize various cognitive abilities, thus promoting brain health and intellectual growth. Here’s why math riddles are beneficial:

1. Cognitive Development: The brain, like any other muscle, benefits from regular exercise. Math riddles serve as an efficient cognitive workout, improving our number skills, pattern recognition, logical reasoning, and problem-solving abilities. They exercise both the left hemisphere, primarily responsible for analytical and logical abilities, and the right hemisphere, which oversees creativity and intuition. This simultaneous engagement helps create a more robust neural network within the brain.

2. Enhanced Memory and Concentration: Solving math riddles often requires keeping multiple pieces of information in mind, thus enhancing working memory. It also demands a high level of focus to interpret the riddle and manipulate the numbers or mathematical concepts correctly.

3. Confidence Boost: The satisfaction of solving a challenging riddle can significantly boost confidence, reinforcing a positive attitude towards learning and problem-solving. This can lead to a more general improvement in academic performance and a greater willingness to tackle complex tasks.

The Power of Math Riddles: Some Fun Facts

Math riddles have been around for centuries, crossing various cultures and civilizations. The ancient Greeks, known for their profound contributions to mathematics and philosophy, often incorporated riddles into their teachings. One of the oldest recorded riddles, found on a clay tablet from ancient Babylon, is a mathematical riddle dating back to 1500 BC!

Here’s another fun fact: Math riddles can sometimes stump even the brightest minds because they often require lateral thinking rather than pure computation. The notorious “bat and ball” riddle mentioned earlier is a prime example. Even students from top universities like Harvard and Princeton had trouble solving it because it initially appears to be a simple algebra problem but is actually designed to challenge our intuitive problem-solving instincts.

Math Riddles: The Joy of Problem-Solving

In conclusion, math riddles are more than just number games. They serve as a bridge between numerical computation and linguistic interpretation, offering a balanced workout for our brains. They encourage us to think outside the box, appreciate the beauty of numbers and language, and find joy in problem-solving. So, the next time you come across a math riddle, remember you’re not only having fun but also strengthening your brain in the process!