How many ways can Mathias solve this symmetry challenge?

Can you remove the least number of points from this diagram, so no three of the remaining points are in a straight line?

Weekly Problem 35 - 2012

How many more triangles need to be shaded to make the pattern have a line of symmetry?

Weekly Problem 31 - 2014

Peri the winkle starts at the origin and slithers around some semicircles. Where does she end her expedition?

Weekly Problem 31 - 2008

The flag is given a half turn anticlockwise about the point O and is then reflected in the dotted line. What is the final position of the flag?

Weekly Problem 19 - 2009

When I looked at the greengrocer's window I saw a sign. When I went in and looked from the other side, what did I see?

What is the smallest number of additional squares that must be shaded so that this figure has at least one line of symmetry and rotational symmetry of order 2?

A card with the letter N on it is rotated through two different axes. What does the card look like at the end?

Can you find the time between 3 o'clock and 10 o'clock when my digital clock looks the same from both the front and back?

Imagine reflecting the letter P in all three sides of a triangle in turn. What is the final result?

I am standing behind five pupils who are signalling a five-digit number to someone on the opposite side of the playground. What number is actually being signalled?

Weekly Problem 11 - 2011

Kanga hops ten times in one of four directions. At how many different points can he end up?

What will the scale on this map be after it has been photocopied?

Given how much this 50 m rope weighs, can you find how much a 100 m rope weighs, if the thickness is different?

If the base and height of a triangle are increased by different percentages, what happens to its area?

What are the possible perimeters of the larger triangle?

What proportion of each of these pendants will be made of gold?

Point A is rotated to point B. Can you find the area of the triangle that these points make with the origin?

How many times a day does a 24 hour digital clock look the same when reflected in a horizontal line?

An ink stamp draws out a shape when it is rotated. What is its area?

The horizontal red line divides this equilateral triangle into two shapes of equal area. How long is the red line?