24 Riddles

Math Riddles

These are the best and most fun math riddles we can find. All of these tricky riddles are based on real math concepts and can be solved with purely math and logic.



Sr. No Title Views Ratings
1 You create your own Where's Waldo game

You create your own Where's Waldo game on a piece of paper. You want your friend to find Waldo but they think you might be pulling a prank on them by not putting Waldo on the paper at all.

How can you prove to your friend that Waldo is on the paper without ruining it for them?

1535
2 You have a flashlight that takes 2 working batteries

You have a flashlight that takes 2 working batteries. You have 8 batteries but only 4 of them work.

What is the fewest number of pairs you need to test to guarantee you can get the flashlight on?

1000
3 What's the angle between minute hand

What's the angle between minute hand and hour hand at a quarter past three?

1055
4 There are several books on a bookshelf

There are several books on a bookshelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

1702
5 As I was going to St. Ives

As I was going to St. Ives, I met a man with seven wives, Each wife had seven sacks, Each sack had seven cats, Each cat had seven kits: Kits, cats, sacks, and wives, How many were there going to St. Ives?

825
6 What is the next number

What is the next number in the sequence? 1 11 21 1211 111221 312211

954
7 There are 100 passengers boarding

There are 100 passengers boarding a 100 passenger airplane. When passenger 1 gets onto the plane, he is dissoriented, so he randomly picks a seat. Each of the remaining passengers (2, 3, 4, etc.) get onto the plane and take their seat if it is available or picks one of the remaining seats at random if it is not. What is the chance that the last passenger (passenger 100) will get his seat?

1003
8 Suppose you're on a game show, and you're given

Suppose you're on a game show, and you're given the choice of three doors: Behind one door is a sports car; behind all of the others is bicycles. You pick a door, say No. 1, and the host, who knows what's behind the doors, opens another door, say No. 2, revealing a bicycle. He then says to you, "Do you want to pick door No. 3?" Is it to your advantage to switch your choice?

979
9 Sum Sam and Product Pete are in class

Sum Sam and Product Pete are in class when their teacher gives Sam the Sum of two numbers and Pete the product of the same two numbers (these numbers are greater than or equal to 2). They must figure out the two numbers. Sam: I don't know what the numbers are Pete. Pete: I knew you didn't know the numbers... But neither do I. Sam: In that case, I do know the numbers. What are the numbers?

1880
10 A claustrophobic person gets on a train.

A claustrophobic person gets on a train. The train enters a tunnel just as it is leaving the station. Where is the best place for him to sit?

1410