Reasoning about the number of matches needed to build squares that share their sides.

Charlie and Alison have been drawing patterns on coordinate grids. Can you picture where the patterns lead?

These grids are filled according to some rules - can you complete them?

Can you complete this jigsaw of the multiplication square?

Can you dissect a square into: 4, 7, 10, 13... other squares? 6, 9, 12, 15... other squares? 8, 11, 14... other squares?

A 2 by 3 rectangle contains 8 squares and a 3 by 4 rectangle contains 20 squares. What size rectangle(s) contain(s) exactly 100 squares? Can you find them all?

Compare the numbers of particular tiles in one or all of these three designs, inspired by the floor tiles of a church in Cambridge.

Katie and Will have some balloons. Will's balloon burst at exactly the same size as Katie's at the beginning of a puff. How many puffs had Will done before his balloon burst?

These alphabet bricks are painted in a special way. A is on one brick, B on two bricks, and so on. How many bricks will be painted by the time they have got to other letters of the alphabet?

We can arrange dots in a similar way to the 5 on a dice and they usually sit quite well into a rectangular shape. How many altogether in this 3 by 5? What happens for other sizes?

Susie took cherries out of a bowl by following a certain pattern. How many cherries had there been in the bowl to start with if she was left with 14 single ones?

Here is a machine with four coloured lights. Can you develop a strategy to work out the rules controlling each light?

Investigate and explain the patterns that you see from recording just the units digits of numbers in the times tables.

When number pyramids have a sequence on the bottom layer, some interesting patterns emerge...

In this investigation, we look at Pascal's Triangle in a slightly different way - rotated and with the top line of ones taken off.

Alison, Bernard and Charlie have been exploring sequences of odd and even numbers, which raise some intriguing questions...

Can you find a way to identify times tables after they have been shifted up?

In this investigation, you are challenged to make mobile phone numbers which are easy to remember. What happens if you make a sequence adding 2 each time?

Cellular is an animation that helps you make geometric sequences composed of square cells.

A story for students about adding powers of integers - with a festive twist.