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Three children are going to buy some plants for their birthdays. They will plant them within circular paths. How could they do this?

Gran, How Old Are You?

When Charlie asked his grandmother how old she is, he didn't get a straightforward reply! Can you work out how old she is?

Follow the Numbers

What happens when you add the digits of a number then multiply the result by 2 and you keep doing this? You could try for different numbers and different rules.

Four Layers

Age 5 to 11 Challenge Level:
Have you checked that your model obeys the rules?
How will you make sure that you don't repeat any?