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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?

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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?

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More Pebbles

Have a go at this 3D extension to the Pebbles problem.

Ip Dip

Stage: 1 and 2 Challenge Level: Challenge Level:1

"Ip dip sky blue!  Who's 'it'?  It's you!"
Have you ever used this rhyme to decide who is 'it' in a game?
If you were playing a game with one friend and you wanted to be chosen to be 'it', would you start the rhyme pointing at yourself or your friend?

If there were three of you, how would you position yourself so that you were sure you'd be chosen?
How about with four of you?  Five ...? Six ...?  Seven ...? Eight ...? Nine ...?  Ten ...?  And so on?
How would you predict where you should stand to be chosen for any number of players?