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List view record 1: Math and Magic. Episode 9, The Magic of Nine [efilm]List view anchor tag for record 1: Math and Magic. Episode 9, The Magic of Nine [efilm]
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Math and Magic. Episode 9, The Magic of Nine [efilm]

2020
Admire the magic of the number nine. An ancient technique called "casting out nines" lets you pick out the missing digit in a bewilderingly long series of operations. Then learn to determine two-digit cube roots and also find the age of a volunteer who has hidden the number in a complicated calcu...
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