You might want to break out a calculator because it takes a genius to solve these tricky math riddles.

1. House numbers

My twin lives at the reverse of my house number. The difference between our house numbers ends in two. What are the lowest possible numbers of our house?


These math riddles aren’t easy to solve. Do you think you know the answer to this one? The lowest possible numbers for our house are 19 and 91. Also, try solving this riddle that only math geeks can figure out.

2.Egg equation

If a hen and a half lay an egg and a half in a day and a half, how many eggs will half a dozen hens lay in half a dozen days?


Two dozen. If you increase both the number of hens and the amount of time available four-fold, the number of eggs increases 16 times. 16 x 1.5 = 24. If math riddles aren’t your thing, try solving these tricky detective riddles.

3.Card question

A small number of cards has been lost from a complete pack. If I deal among four people, three cards remain. If I deal among three people, two remain and if I deal among five people, two cards remain. How many cards are there?


There are 47 cards.

4.Knight moves

I have a calculator that can display ten digits. How many different ten-digit numbers can I type using just the 0-9 keys once each, and moving from one keypress to the next using the knight’s move in chess? (In chess, the knight move in an L-shape – one square up and two across, two squares down and one across, two squares up and one across, and other like combinations)


You can form the numbers 5034927618 and 5038167294. You can also form their reverses: 8167294305 and 4927618305. Hence four different numbers can be made. The key point is to realize that the number must start or end on the ‘5’ key, followed/preceded by the ‘0’ key, otherwise, there is no way of using all ten keys during the route. Only 2 percent of people can solve Einstein’s Riddle. Can you?

5.Two by two

You know 2 + 2 comes to the same as 2 x 2. Now find a set of three different whole numbers whose sum is equal to their total when multiplied.


The three different whole numbers whose sum is equal to their total when multiplied are 1, 2, and 3. Next, try to spot the image that isn’t like the others in this picture.