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problem

Take a square

14 to 16

Cut off three right angled isosceles triangles to produce a pentagon. With two lines, cut the pentagon into three parts which can be rearranged into another square.

problem

Comparing totals

11 to 14

Can you work out the solution to this tricky summation problem?

problem

Favourite

Circles, circles

5 to 11

Here are some arrangements of circles. How many circles would I need to make the next size up for each? Can you create your own arrangement and investigate the number of circles it needs?

problem

Clock face

7 to 11

Where can you draw a line on a clock face so that the numbers on both sides have the same total?

problem

'Tis whole

14 to 18

Take a few whole numbers away from a triangle number. If you know the mean of the remaining numbers can you find the triangle number and which numbers were removed?