problem Straw Scaffold Age 11 to 14 Challenge level Build a scaffold out of drinking-straws to support a cup of water

problem Toad in the Hole Age 11 to 14 Challenge level Is it cheaper to cook a meal from scratch or to buy a ready meal? What difference does the number of people you're cooking for make?

problem The Fastest Cyclist Age 14 to 16 Challenge level Andy is desperate to reach John o'Groats first. Can you devise a winning race plan?

problem Nutrition and Cycling Age 14 to 16 Challenge level Andy wants to cycle from Land's End to John o'Groats. Will he be able to eat enough to keep him going?

problem Triathlon and Fitness Age 11 to 14 Challenge level The triathlon is a physically gruelling challenge. Can you work out which athlete burnt the most calories?

problem Tray Bake Age 11 to 14 Challenge level My recipe is for 12 cakes - how do I change it if I want to make a different number of cakes?

problem Retiring to paradise Age 11 to 14 Challenge level When Charlie retires, he's looking forward to the quiet life, whereas Alison wants a busy and exciting retirement. Can you advise them on where they should go?

problem Tennis Club Age 14 to 16 Challenge level Three-quarters of the junior members of a tennis club are boys and the rest are girls. What is the ratio of boys to girls among these members?

problem Speed-time problems at the Olympics Age 14 to 16 Challenge level Have you ever wondered what it would be like to race against Usain Bolt?