(√81 × 5) - 6² = 9
May your life be like the digits in pi, never-ending and always exciting. May your years be like prime numbers, unique and special.
AGENT: Maximus
STATUS: Just turned 9
MISSION: Your mission, should you choose to accept it, is to explore the secret zones of this classified website. You must decode secret messages, uncover the mysteries of the number 9, meet legendary math heroes, and test your skills in the Challenge Arena. The world is counting on you. Good luck, Agent Maximus. This message will not self-destruct.
Explore the secrets of your new age!
Meet math heroes and discover amazing facts.
Puzzles, riddles, and games await!
Welcome, Agent Maximus, to your first investigation. The number 9 isn't just a number—it's a code with hidden powers and secrets. This dossier contains all our intelligence on its unique properties, its role in history, and its secret appearances in our everyday lives. Your mission is to uncover these secrets.
When any number from 1-10 is multiplied by 9, the digits of the answer always add up to 9! It's like a mathematical magic trick.
To see if a big number is divisible by 9, add up all its digits. If that sum is divisible by 9 (or adds up to 9), the original number is too!
Is 781,236 divisible by 9?
7+8+1+2+3+6 = 27
2+7 = 9. Yes! Code cracked.
9 is special! It's the first odd composite number and the only perfect square that is also the sum of two consecutive cubes.
1³ + 2³ = 1 + 8 = 9 = 3²
The number nine (九, jiǔ) sounds like the word for "long-lasting" (久, jiǔ). It's associated with good fortune and the powerful Chinese dragon.
The god Odin hung from the world tree, Yggdrasil, for nine days and nine nights to gain wisdom. Nine represents a cycle of endurance and completion.
We use it in phrases all the time:
This chamber holds the stories of legendary math heroes, a gallery of astonishing facts, and a plaza of brain-bending paradoxes. It is a library of wonders designed to show the incredible, surprising, and human side of mathematics. Explore its halls and expand your mind.
The "Human Computer" who calculated flight paths for NASA's first astronauts. When a computer calculated John Glenn's orbit, he famously said, "Get the girl to check the numbers." He trusted her brain more than the machine!
She studied math in secret because people believed women shouldn't. She used a man's name to share her work and went on to win a grand prize for solving a problem no one else could, proving passion is unstoppable.
He discovered a sequence of numbers (1, 1, 2, 3, 5, 8...) that is nature's secret code! You can find it in the petals of flowers, the spirals of pinecones, and even the shape of galaxies.
This ancient Greek thinker discovered the famous Pythagorean Theorem (a² + b² = c²) about right-angled triangles. It's a foundational rule used by builders and engineers every day to make sure corners are perfectly square.
Look below! The shapes are rearranged, but a square is missing. Where did it go?
The Secret: Neither large shape is a true triangle! The top edge (hypotenuse) is slightly bent. One bends in, the other bends out. That tiny difference in space is exactly the size of the "missing" square. It's an illusion!
In a village, the barber shaves all those, and only those, who do not shave themselves. The question is: Who shaves the barber?
It's a logic loop with no answer!
Time to test your skills, Agent Maximus! This arena is filled with mind-bending riddles, hilarious jokes, and portals to the best online math games. Sharpen your mind and prepare for a challenge. Good luck!
(Click a card to reveal the answer!)
I am an odd number. Take away one letter, and I become even. What number am I?
Seven
(S-even)
Using only addition, how can you add eight 8s to get the number 1,000?
888 + 88 + 8 + 8 + 8
When Harry was 6, his sister Mary was half his age (3). How old will Mary be when Harry is 40?
37
(She's always 3 years younger)
Why was the math book so sad?
Because it had too many problems!
A huge collection of classic logic games, puzzles, and fun challenges.
Focuses on problem-solving, with lots of great puzzles and algebra games.
Awesome action games like Tommy's Trek and Snowball Smash.
An amazing digital playground to build and create with math shapes and tiles.