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Mathematics 19 Online
OpenStudy (anonymous):

Find the missing digit to make 18,59_ divisible by 9

OpenStudy (experimentx):

4

OpenStudy (anonymous):

1 + 8 = 9, toss it out toss out the other 9 that leaves 5 solve 5 + ? = 9 get 4

OpenStudy (experimentx):

1+8+5+9+x must be divisible by 9

OpenStudy (anonymous):

procedure called "casting out nines"

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