BRAINERD, Minn. -- Consider this math problem: Find the square root of 49, double it, minus 5, square it, subtract 1, divide by 4, cut in half, cut in half, subtract 1, divide by 2, cut in half, cut ...
A 10-year-old South African boy, Sibahle Zwane’s mesmerising exploits have gone viral on social media. Zwane has the amazing ability to answer complex arithmetic questions faster than a calculator and ...
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