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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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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?

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Bracelets

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

Money Measure

Age 7 to 11 Challenge Level:

How can you make one weighing that will tell you something about all the boxes at once?

How many boxes are different?

Is it worth taking different coins out of the different boxes?