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Puzzles

One activity that many of our members enjoy is puzzling! You can test yourself for fun with our brainteasers. Our quizzes and conundrums are updated regularly, so do check back on the page for the latest content, and if you get really good at them, why not find out what your IQ is by booking a Mensa Supervised IQ Test?

15/8/25 – Types of Number

Fill the 10 empty boxes with the numbers 1-10. Replace the lettered boxes with a mathematical description of the numbers in that row or column.

Numbers must comply with both the row descriptor and the column descriptor. The numbers 1 and 2 have already been entered. Descriptors are given below in random order.

A B C

D

E

1

F

 X X

G

2

* CUBE NUMBERS  * PRIME NUMBERS  * TRIANGULAR NUMBERS  * MULTIPLE OF 5  * FACTORS OF 36  * ODD NUMBERS  * FACTORS OF 40

Puzzle courtesy of Mensa member Peter Hooton

  • Show Answer
A B C D

E

 6 10 1

3

F

 9 X X

7
G 4 5 8

2

A = FACTORS OF 36
B = MULTIPLES OF 5
C = CUBE NUMBERS
D = PRIME NUMBERS
E = TRIANGULAR NUMBERS
F = ODD NUMBERS
G = FACTORS OF 40

Puzzles for business use

We are also able to supply puzzle content to businesses, tailored to your needs. This can range from one-off media projects for marketing campaigns and content for newspapers, magazines and company websites, to long-running partnerships and licensing agreements.

Find out more by contacting our marketing team, via: communications@mensa.org.uk