Pebbles

Place four pebbles on the sand in the form of a square. Keep adding as few pebbles as necessary to double the area. How many extra pebbles are added each time?

I'm Eight

Find a great variety of ways of asking questions which make 8.

Sweets in a Box

How many different shaped boxes can you design for 36 sweets in one layer? Can you arrange the sweets so that no sweets of the same colour are next to each other in any direction?

Two Primes Make One Square

Stage: 2 Challenge Level:

What are the squares of the numbers from $4$ to $20$?
What happens when you add two prime numbers together?
What happens if you add two different prime numbers together?