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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?

It Figures

Suppose we allow ourselves to use three numbers less than 10 and multiply them together. How many different products can you find? How do you know you've got them all?

Bracelets

Investigate the different shaped bracelets you could make from 18 different spherical beads. How do they compare if you use 24 beads?

Give Me Four Clues

Age 7 to 11 Challenge Level:

You could print off this sheet of the problem and mark or shade the grid somehow.
Which clue can you immediately see is not needed?
Which clue gives you the same information as the last two clues?