There are lots of different methods to find out what the shapes are worth - how many can you find?

Caroline and James pick sets of five numbers. Charlie chooses three of them that add together to make a multiple of three. Can they stop him?

Many numbers can be expressed as the difference of two perfect squares. What do you notice about the numbers you CANNOT make?

Are these statistical statements sometimes, always or never true? Or it is impossible to say?

This group tasks allows you to search for arithmetic progressions in the prime numbers. How many of the challenges will you discover for yourself?

Match the charts of these functions to the charts of their integrals.

Explore the properties of some groups such as: The set of all real numbers excluding -1 together with the operation x*y = xy + x + y. Find the identity and the inverse of the element x.

Which of these triangular jigsaws are impossible to finish?

Weekly Problem 51 - 2008

This grid can be filled up using only the numbers 1, 2, 3, 4, 5 so that each number appears just once in each row, once in each column and once in each diagonal. Which number goes in the centre square?

Weekly Problem 20 - 2015

Four brothers give statements about the order they were born in. Can you work out which two are telling the truth?

Weekly Problem 44 - 2011

You have already used Magic Squares, now meet an Anti-Magic Square. Its properties are slightly different, but can you still solve it...

Weekly Problem 30 - 2015

How many ways are there of completing this table so that each row tells you how many there are of the numbers 1, 2, 3 and 4?

Weekly Problem 41 - 2007

The Queen of Spades always lies for the whole day or tells the truth for the whole day. Which of these statements can she never say?

When is it impossible to make number sandwiches?

Weekly Problem 11 - 2015

If it takes 852 digits to number all the pages of a book, what is the number of the last page?

Weekly Problem 13 - 2015

When the numbers from 1 to 1000 are written on a blackboard, which digit appears the most number of times?

Can you find the values at the vertices when you know the values on the edges?

Weekly Problem 41 - 2016

The diagram shows a square, with lines drawn from its centre. What is the shaded area?

Weekly Problem 47 - 2017

How many numbers do I need in a list to have two squares, two primes and two cubes?

Can you create a Latin Square from multiples of a six digit number?

Can you find out what is special about the dimensions of rectangles you can make with squares, sticks and units?

Charlie likes tablecloths that use as many colours as possible, but insists that his tablecloths have some symmetry. Can you work out how many colours he needs for different tablecloth designs?