Struggling with mental math? Students from class 6 to 10 now have a clever way to simplify tricky multiplication problems. The “doubling square” method turns large or complex calculations into quick, ...
May 21 (UPI) --An 11-year-old Florida girl earned a Guinness World Record for mental math when she solved a 12-digit multiplication problem without a calculator, pen or paper. Sanaa Hiremath, who was ...
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