Are you a maths whizz? Test yourself on questions Sheffield schoolboy answered to claim UK crown

If you can answer any of these questions then you're doing well!
If you can answer any of these questions then you're doing well!
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A Sheffield schoolboy is preparing to take on some of the world's best young mathematicians after winning a UK title.

Yuji Okitani, from Crosspool, won the UK final of the Who Wants to Be a Mathematician competition and is now jetting off to the US for the grand final, but could you answer the questions he faced to earn his place there?