Are these statements relating to calculation and properties of shapes always true, sometimes true or never true?...
This multiplication uses each of the digits 0 - 9 once and once only. Using the information given, can you replace the stars in the calculation with figures?...
In this activity, the computer chooses a times table and shifts it. Can you work out the table and the shift each time?...
Which pairs of cogs let the coloured tooth touch every tooth on the other cog? Which pairs do not let this happen? Why?...
It's easy to work out the areas of most squares that we meet, but what if they were tilted?...
Which line graph, equations and physical processes go together?...
Can you make sense of the three methods to work out what fraction of the total area is shaded?...
Tiny particles like pollen grains move constantly, pushed and pulled by environmental forces. To study this motion, physicists use a "random walk" model—a system in which every step is determined by a random process. Random walks are useful for studying everything from tiny physics to diffusion to...
Neural networks have been powering breakthroughs in artificial intelligence, including the large language models that are now being used in a wide range of applications, from finance, to human resources to health care. But these networks remain a black box whose inner workings engineers and...
Four friends must cross a bridge. How can they all cross it in just 17 minutes?...
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