You may also like

problem icon


How many faces can you see when you arrange these three cubes in different ways?

problem icon


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?

problem icon


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

Flashing Lights

Age 7 to 11 Challenge Level:
When will the first light flash?
When will the second light flash?
So when will they flash together?
Could you predict when they would next flash together? How?