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Number Detective

Follow the clues to find the mystery number.

Prime Magic

Place the numbers 1, 2, 3,..., 9 one on each square of a 3 by 3 grid so that all the rows and columns add up to a prime number. How many different solutions can you find?

Diagonal Trace

You can trace over all of the diagonals of a pentagon without lifting your pencil and without going over any more than once. Can the same thing be done with a hexagon or with a heptagon?

Various Venns

Age 7 to 11 Challenge Level:

Can you place the numbers from 0 to 51 into this Venn diagram?

How do you know where to put each number?
You might like to print off this sheet.


Here is another one for you to try.
Again, you might like to print off this sheet.


The third Venn diagram below is a little different. This time you need to decide what sets the two groups represent. Choose the labels from the list on the right.


Here is a sheet you can print.

Can you explain how you worked it out?