Can you cut the E into seven pieces with just four straight cuts and reassemble the pieces into a square? Solution When I wrote that you need to cut it into seven pieces, it’s actually a hint. Did you figure it out? The letter “E” figure above is constructed using the seven tangram pieces. So, if you were able to figure […]

During third grade, my English teacher challenged us to answer some riddles. Here’s the first question: How do you put an elephant inside a refrigerator? There are three steps. I realized that this was part of a series of old riddles which are connected to each other. To not spoil my classmates’ fun, I refrained […]

Here’s another match equation puzzle. The illustration represents an incorrect Roman numerals equation (3 = 30). Move only two matches to make this equation valid. You cannot shift the position of the other matches. Solution (Click to Show) The solution involves Roman numerals and a multiplication sign. So, it can be read as: C = […]

In 1894, Christopher L. Ward of Wilmington, Delaware wrote the following riddle for two young ladies: When you seek a harder question To unriddle, your suggestion, I am sure, itself suggests its answer plain. It has puzzled many sages Of many lands and ages. But no doubt you will not tackle it in vain. Ward […]

Aside from letter E, is there another which letter could follow this sequence? Solution (Click to Show) F. Write it on top of the line to form the letter E. This question was asked by our third-grade English teacher. Three of us, including me, figured out the answer almost at the same time after half […]

The above illustration depicts an invalid Roman numerals equation (the left side is 6 and the right side is 2) using seven matches. Find a way to correct this equation by only moving one match. You cannot shift the position of the other matches. Solution (Click to Show) As is equal to 1, the equation […]

Q: How can a cheetah change its spots? A: By moving. Q: The beginning of eternity, the end of time and space, the beginning of every end, and the end of every place. A: 2.718281828… Q: The maker doesn’t need it, the buyer doesn’t want it, and the owner doesn’t know he has it. What […]

The difference between two consecutive primes is called prime gap. Prime gaps are always even except for the prime gap between 2 (the first prime and the only even prime) and 3 (the first odd prime), which is 1. At first, prime gaps are small. As the primes get bigger, larger prime gaps start to […]

Here is a classic one. The illustration below depicts nine dots in the form of a square. Draw four straight lines in such a way that each dot is crossed out. The restrictions: You cannot cross a dot more than once. You must not retrace any line. You are not permitted to lift your pencil […]

The following riddle appeared on the April 25, 1868 edition of Once a Week. It was claimed by the anonymous composer of the riddle that it is insoluble: When from the ark’s capacious round, The world went forth in pairs, Whose ready ears first heard the sound Of boots. upon the stairs? The riddle was somehow attributed […]