Are you someone who is good at math? Or maybe you just think you are…

Either way, these 5 riddles are designed to challenge your skills, so give them a shot!

#5. If my twin lives at the reverse of my house number, and the difference between our house numbers ends in two. What are the lowest possible numbers of our house?

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#5. What is the lowest possible house number of two houses if the numbers are the reverse of each other and the difference ends in two?

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19.

The two numbers would be 19 and 91.

 

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

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#4. How many eggs will half a dozen hens lay in half a dozen days?

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2 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.

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#3. A formerly complete pack of cards is now missing a small number. If I deal them out to four people, three cards remain. If I deal among three people, two remain and if I deal them to five people, two remain.

How many cards are there?

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#3. How many cards are there?

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There are 47 cards.

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#2. If my calculator can display 10 digits, how many different 10-digit numbers can I type using just the 0-9 keys once apiece, and moving from one keypress to the next using the knight’s move in chess (the L-shape of one square up and two across, two squares down and one across, two squares up and one across, etc).

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#2. How many different 10-digit numbers can I type by moving my finger like a knight in chess?

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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.

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#1. 2 + 2 gets the same answer as 2 x 2, but can you find a set of three different whole numbers whose sum is equal to their total when multiplied?

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#1. Can you find a set of 3 different whole numbers whose sum is equal to their total when multiplied?

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The three different whole numbers whose sum is equal to their total when multiplied are 1, 2, and 3.

We hope you enjoyed these riddles!