Explaining, convincing and proving

Think of a number, square it and subtract your starting number. Is the number you're left with odd or even? How do the images help to explain this?

Four of these clues are needed to find the chosen number on this grid and four are true but do nothing to help in finding the number. Can you sort out the clues and find the number?

Can you put the numbers 1-5 in the V shape so that both 'arms' have the same total?

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

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

This group activity will encourage you to share calculation strategies and to think about which strategy might be the most efficient.

What statements can you make about the car that passes the school gates at 11am on Monday? How will you come up with statements and test your ideas?

Tom and Ben visited Numberland. Use the maps to work out the number of points each of their routes scores.

Watch the video to see how to fold a square of paper to create a flower. What fraction of the piece of paper is the small triangle?