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A number is divisible by 9 if the sum of its digits is greater than or equal to 9. 621 (6+2+1=9), for instance, is divisible by 9. Simply move the decimal point one place to the left to find the ...

“It is sad that her techniques to simplify math were not used by educational institutions,” said D.C. Shivdev, a trustee of the Shakuntala Devi Educational Foundation Public Trust. “She ...