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Reaction Timer

11 to 14

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

A cartoon worm.
problem

Worms

7 to 11

Place this "worm" on the 100 square and find the total of the four squares it covers. Keeping its head in the same place, what other totals can you make?

Part 2: Lucky Dip
problem

Part 2: Lucky Dip

11 to 14

Julia introduces the 'Lucky Dip model', and the accompanying interactivity, which take into account the impact of herd immunity.

Differs
problem

Differs

11 to 14
Choose any 4 whole numbers and take the difference between consecutive numbers, ending with the difference between the first and the last numbers. What happens when you repeat this process over and over again?
Travelling Salesman
problem

Travelling Salesman

11 to 14
A Hamiltonian circuit is a continuous path in a graph that passes through each of the vertices exactly once and returns to the start. How many Hamiltonian circuits can you find in these graphs?
Eating for a Better Planet
problem

Eating for a Better Planet

11 to 16
How do you balance the environmental impacts and nutritional benefits of different foods?
Multiply the Addition Square
problem

Multiply the Addition Square

11 to 14

If you take a three by three square on a 1-10 addition square and multiply the diagonally opposite numbers together, what is the difference between these products. Why?

Moving Squares
problem

Moving Squares

14 to 16
How can you represent the curvature of a cylinder on a flat piece of paper?
A brown snail on a green leaf.
problem

Slippery Snail

7 to 16

A game for two people, who take turns to move the counters. The player to remove the last counter from the board wins.

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