Can you remove the least number of points from this diagram, so no three of the remaining points are in a straight line?
The squares of this grid contain one of the letters P, Q, R and S. Can you complete this square so that touching squares do not contain the same letter? How many possibilities are there?
This grocer wants to arrange his fruit in a particular order, can you help him?
Weekly Problem 21 - 2011
How many ways can you paint this wall with four different colours?
How many ways are there of completing the mini-sudoku?
Two of the numbers in a 4×4 magic square have been swapped. Can you work out the sum of these numbers?
Can you work out the sum of the missing digits in this subtraction?
Weekly Problem 31 - 2016
The diagram shows a grid of $16$ identical equilateral triangles. How many rhombuses are there made up of two adjacent small triangles?
Two of the four small triangles are to be painted black. In how many ways can this be done?
In the multiplication table on the right, only some of the numbers have been given. What is the value of A+B+C+D+E?
