Challenge Level

Explore the properties of this iterative geometrical procedure

Challenge Level

Investigate constructible images which contain rational areas.

Challenge Level

Can you find some Pythagorean Triples where the two smaller numbers differ by 1?

Challenge Level

How would you judge a competition to draw a freehand square?

Challenge Level

What's the chance of a pair of lists of numbers having sample correlation exactly equal to zero?

Challenge Level

Explore the properties of this different sort of differential equation.

Challenge Level

Explore the properties of combinations of trig functions in this open investigation.

Challenge Level

What can you create using 140 characters and our cool Twilgo environment?

Challenge Level

Explore creating 'factors and multiples' graphs such that no lines joining the numbers cross