Math Riddles
Most Famous Math Riddles of All Time!
We have created a collection of some of the best math riddles so you can read and share anytime with your friends and family.
What is the only even number in all of mathematics that is also classified as a prime number?
Answer
2. Every other even number can be divided evenly by 2, disqualifying it from being prime, but 2 itself has no divisors besides 1 and itself.
What two-digit number reads exactly the same even when turned completely upside down?
Answer
69. When rotated 180 degrees, the digits 6 and 9 swap positions and shapes, leaving the number looking identical.
Popular Riddles Topics for You.
What do you get when you add every whole number from 1 through 10 together?
Answer
55. Adding 1+2+3+4+5+6+7+8+9+10 in sequence totals exactly 55.
I am the only number where the count of letters in my spelled-out name exactly equals my own numeric value. What number am I?
Answer
4. The word "four" is spelled with exactly four letters, making it the unique number that matches its own letter count.
Food Riddles
How many straight sides does a standard red stop sign have?
Answer
8 sides. Stop signs are shaped as a regular octagon, making them instantly recognizable even from a distance or from behind.
How can half of the number 8 equal zero?
Answer
Cut the numeral 8 horizontally in half — each half forms the shape of a zero (0).
Which number, when spelled out in English, has its letters appear in perfect alphabetical order?
Answer
Forty. The letters F-O-R-T-Y appear in increasing alphabetical sequence.
What math symbol, placed between 5 and 9, creates a number smaller than 5?
Answer
A decimal point. Writing 5.9 produces a value smaller than the number 9, and a point between them like ".9" is less than 5 too — but the classic answer is the decimal point itself reducing the combined value.
Three consecutive whole numbers add up to 24. What are the three numbers?
Answer
7, 8, and 9. Their sum is exactly 24.
Science Riddles
A farmer has 17 sheep, and all but 9 of them run away. How many sheep does he have left?
Answer
9. The phrase "all but 9" means 9 remain behind.
Related Riddles Topics for You.
Related Top Riddles Topics for You.
Guys, we are trying to share Unique Math Riddles, so you will not get to read the same things again and again on our website. You can also share your favorites on Facebook or send them to a friend who loves to reading riddles.
