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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?

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Maze 100

Can you go through this maze so that the numbers you pass add to exactly 100?

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Highest and Lowest

Put operations signs between the numbers 3 4 5 6 to make the highest possible number and lowest possible number.

Sweets in a Box

Stage: 2 Challenge Level: Challenge Level:1

How many different rectangular-shaped boxes can you make using $36$ squares?
Could you make boxes in any other shape?