Use the Cuisenaire rods environment to investigate ratio. Can you find pairs of rods in the ratio 3:2?

Use the interactivities to fill in these Carroll diagrams. How do you know where to place the numbers?

A train building game for two players. Can you be the one to complete the train?

An environment which simulates working with Cuisenaire rods.

Try entering different sets of numbers in the number pyramids. How does the total at the top change?

The number of plants in Mr McGregor's magic potting shed increases overnight. He'd like to put the same number of plants in each of his gardens, planting one garden each day. How can he do it?

Calculate the fractional amounts of money to match pairs of cards with the same value.

Can you find the pairs that represent the same amount of money?

Can you complete this jigsaw of the multiplication square?

Train game for an adult and child. Who will be the first to make the train?

Here is a chance to play a fractions version of the classic Countdown Game.

Can you explain the strategy for winning this game with any target?

These interactive dominoes can be dragged around the screen.

A game for two people, or play online. Given a target number, say 23, and a range of numbers to choose from, say 1-4, players take it in turns to add to the running total to hit their target.

A and B are two interlocking cogwheels having p teeth and q teeth respectively. One tooth on B is painted red. Find the values of p and q for which the red tooth on B contacts every gap on the. . . .

Use an Excel to investigate division. Explore the relationships between the process elements using an interactive spreadsheet.

Do you know how to find the area of a triangle? You can count the squares. What happens if we turn the triangle on end? Press the button and see. Try counting the number of units in the triangle now. . . .

Can you put the 25 coloured tiles into the 5 x 5 square so that no column, no row and no diagonal line have tiles of the same colour in them?

This problem is based on a code using two different prime numbers less than 10. You'll need to multiply them together and shift the alphabet forwards by the result. Can you decipher the code?

In this activity, the computer chooses a times table and shifts it. Can you work out the table and the shift each time?

A game for two people that can be played with pencils and paper. Combine your knowledge of coordinates with some strategic thinking.

The aim of the game is to slide the green square from the top right hand corner to the bottom left hand corner in the least number of moves.

A game for 2 players that can be played online. Players take it in turns to select a word from the 9 words given. The aim is to select all the occurrences of the same letter.

Here is a chance to play a version of the classic Countdown Game.

We can show that (x + 1)² = x² + 2x + 1 by considering the area of an (x + 1) by (x + 1) square. Show in a similar way that (x + 2)² = x² + 4x + 4

The 2012 primary advent calendar features twenty-four of our posters, one for each day in the run-up to Christmas.

Can you find a reliable strategy for choosing coordinates that will locate the treasure in the minimum number of guesses?

Can you beat the computer in the challenging strategy game?

Is it possible to place 2 counters on the 3 by 3 grid so that there is an even number of counters in every row and every column? How about if you have 3 counters or 4 counters or....?

This 100 square jigsaw is written in code. It starts with 1 and ends with 100. Can you build it up?

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

Use Excel to explore multiplication of fractions.

Practise your number bonds whilst improving your memory in this matching pairs game.

Use an interactive Excel spreadsheet to investigate factors and multiples.

Practise your tables skills and try to beat your previous best score in this interactive game.

Can you match pairs of fractions, decimals and percentages, and beat your previous scores?

A simple file for the Interactive whiteboard or PC screen, demonstrating equivalent fractions.

Investigate the smallest number of moves it takes to turn these mats upside-down if you can only turn exactly three at a time.

Use an Excel spreadsheet to explore long multiplication.

Mr McGregor has a magic potting shed. Overnight, the number of plants in it doubles. He'd like to put the same number of plants in each of three gardens, planting one garden each day. Can he do it?

Use Excel to investigate the effect of translations around a number grid.

Use an interactive Excel spreadsheet to explore number in this exciting game!

Use Excel to practise adding and subtracting fractions.

Watch this film carefully. Can you find a general rule for explaining when the dot will be this same distance from the horizontal axis?

An Excel spreadsheet with an investigation.

Add or subtract the two numbers on the spinners and try to complete a row of three. Are there some numbers that are good to aim for?

Two engines, at opposite ends of a single track railway line, set off towards one another just as a fly, sitting on the front of one of the engines, sets off flying along the railway line...