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When faced with a complicated maths problem, many of us will instinctively get our calculators out.
But a new quiz will test your basic numeracy skills - and you're only allowed a pen and pad of paper to assist you.
The tricky test, created by Playbuzz user Bruce Boyena, begins with relatively straightforward sums, before moving into fiendishly difficult territory.
According to the quiz's creator, only one in 10 people will be able to complete the test without using a calculator.
And you'll need to remember how to do long division and multiplication in order to successfully complete the test.
So... how many of the 12 questions below can you correctly answer? The solutions are in a table at the bottom.