Secondary interactive resources

Can you select the missing digit(s) to find the largest multiple?

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

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.

Think of a number and follow the machine's instructions... I know what your number is! Can you explain how I know?

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

What is the smallest number of answers you need to reveal in order to work out the missing headers?

The Number Jumbler can always work out your chosen symbol. Can you work out how?

Can you use the clues to complete these 4 by 4 Mathematical Sudokus?

In each of these games, you will need a little bit of luck and your knowledge of place value to develop a winning strategy.

Arrange the four number cards on the grid, according to the rules, to make a diagonal, vertical or horizontal line.

I'm thinking of a number. My number is both a multiple of 5 and a multiple of 6. What could my number be?

Some of the numbers have fallen off Becky's number line. Can you figure out what they were?

In this interactivity each fruit has a hidden value. Can you deduce what each one is worth?

Can you use the clues to complete these 5 by 5 Mathematical Sudokus?

How much can you read into a T-shirt?

How many moves does it take to swap over some red and blue frogs? Do you have a method?

What do you notice about the sum of two identical triangular numbers?

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

It's easy to work out the areas of most squares that we meet, but what if they were tilted?

Draw some isosceles triangles with an area of $9$cm$^2$ and a vertex at (20,20). If all the vertices must have whole number coordinates, how many is it possible to draw?

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

Can you find triangles on a 9-point circle? Can you work out their angles?

Discs are flipped in the air. You win if all the faces show the same colour. What is the probability of winning?

Are these games fair? How can you tell?

Experiment with the interactivity of "rolling" regular polygons, and explore how the different positions of the dot affects the distance it travels at each stage.

Find the frequency distribution for ordinary English, and use it to help you crack the code.

Can you guess the colours of the 10 marbles in the bag? Can you develop an effective strategy for reaching 1000 points in the least number of rounds?

This interactivity invites you to make conjectures and explore probabilities of outcomes related to two independent events.

This problem offers you two ways to test reactions - use them to investigate your ideas about speeds of reaction.

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

Can you work out which drink has the stronger flavour?

Think of a number and follow my instructions. Tell me your answer, and I'll tell you what you started with! Can you explain how I know?

A circle rolls around the outside edge of a square so that its circumference always touches the edge of the square. Can you describe the locus of the centre of the circle?

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

A tilted square is a square with no horizontal sides. Can you devise a general instruction for the construction of a square when you are given just one of its sides?