Maths either strikes deep fear into people or it’s just part and parcel of their everyday day lives.
On days like World Maths Day, this means you’re either reminiscing at a time when you had to battle with quadratics or feeling quietly smug with your mathematical abilities.
Whatever your ability, it’s time to put those skills to the test. We’ve put together some of the hardest problems we could find across the web.
Can you solve them all?