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 42 - Mental Games and Competitions - Mental Calculation
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Record Name       Description
Mental Calculation, Addition       mental calculation, adding ten 10-digit numbers...
Multiplying two 8-digit numbers       mental calculation, multiplying two 8-digit numbers...
Calendar from Memory       calculating the day of the week...
Mental Calculation, Square Roots       calculating the square roots from ten 6-digit numbers...
Multiplying two 5-digit numbers       Multiplying two 5-digit numbers...
Mental Calculation, Factorizing       Factorizing 5-digit numbers...
Mental Calculation, Division       Dividing 10-digit numbers by 5-digit numbers...