Reasoning, convincing and proving

This jar used to hold perfumed oil. It contained enough oil to fill granid silver bottles. Each bottle held enough to fill ozvik golden goblets and each goblet held enough to fill vaswik crystal spoons. Each day a spoonful was used to perfume the bath of a beautiful princess. For how many days did the whole jar last? The genie's master replied: Five hundred and ninety five days. What three numbers do the genie's words granid, ozvik and vaswik stand for?

Is it possible to rearrange the numbers 1,2......12 around a clock face in such a way that every two numbers in adjacent positions differ by any of 3, 4 or 5 hours?

Find a connection between the shape of a special ellipse and an infinite string of nested square roots.

Change the squares in this diagram and spot the property that stays the same for the triangles. Explain...

In this addition each letter stands for a different digit, with S standing for 3. What is the value of YxO?

Can you work out where the blue-and-red brick roads end?

Explore what happens when you draw graphs of quadratic equations with coefficients based on a geometric sequence.

A and B are two fixed points on a circle and RS is a variable diamater. What is the locus of the intersection P of AR and BS?

Explain why, when moving heavy objects on rollers, the object moves twice as fast as the rollers. Try a similar experiment yourself.

Prove that if a^2+b^2 is a multiple of 3 then both a and b are multiples of 3.