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Charlie and Abi put a counter on 42. They wondered if they could visit all the other numbers on their 1-100 board, moving the counter using just these two operations: ×2 and -5. What do you think?

Julia refines our model, and the interactivity offers a chance to simulate the outbreak of an infectious disease, recognising that not everyone is the same.

Which of these roads will satisfy a Munchkin builder?

Can you make sense of the charts and diagrams that are created and used by sports competitors, trainers and statisticians?

Explore the area of families of parallelograms and triangles. Can you find rules to work out the areas?

Can you make sense of these three proofs of Pythagoras' Theorem?

If you have a large supply of 3kg and 8kg weights, how many of each would you need for the average (mean) of the weights to be 6kg?

Using the digits 1 to 9, the number 4396 can be written as the product of two numbers. Can you find the factors?

Ben, Jack and Emma passed counters to each other and ended with the same number of counters. How many did they start with?

Investigate the sum of the numbers on the top and bottom faces of a line of three dice. What do you notice?