10ticks Friday Puzzle

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Welcome to Ian’s Friday Puzzle! Dust off those Friday cobwebs with a little manipulation of the old grey matter. Perplexing puzzles, logical, illogical, and sometimes just plain stupid. Be prepared to be bewildered, befuddled and bedazzled!

See the latest Friday Puzzle below and look at all the past puzzles. Get the Friday Puzzle straight to your phone, follow us on Twitter. The first 5 correct answers join our Hall of Fame!

This week's Friday Puzzle


√1 × √2 × √3 × √4 × √5 × √6 × √7 × √8 × √9 × √10


No calculator, think pairs! 

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Friday Puzzle (20/03/2020)

Jane buys three different bricks for £10.50.

None are free.

1 brick costs 3 times another.

1 brick costs 8 times another.

What is the price of the cheapest brick?

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Friday Puzzle (13/03/2020)

Find two numbers, neither of which has a 0 digit, whose product is 1 000 000 (one million).

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Friday Puzzle (06/03/2020)

I’m thinking of a number.

It is the sum of all the natural numbers from 1 to 1000.

What is the number?

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Friday Puzzle (28/02/2020)

A number is increased by four and the result doubled. This result is squared, which gives a number that is eight more than 68 times the original number.

Find two possible answers!

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Friday Puzzle (21/02/2020)

A cheetah can run as fast as 75 mph in short bursts.

A snail only manages half a mile in 15 hours.

How many times faster can a cheetah move than a snail?

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Friday Puzzle (14/02/2020)

The number 12345 can be expressed as the sum of two prime numbers.


What are the two prime numbers?

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Friday Puzzle (07/02/2020)

I have five whole numbers and they have no mode.

Their median is 6 and mean is 5. Their range is 9.

What are the five numbers?

(There may be more than one answer!)

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Friday Puzzle (31/01/2020)

In my fully limbed ­­collection of 186 spiders and ladybirds I count 1300 legs.

How many spiders do I have? How many ladybirds do I have?

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Friday Puzzle (24/01/2020)


Find n.

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