Art of Problem Solving Prealgebra: Divisibility Rules for 3 and 9

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This is called the Number strand here in Australia, rather than PreAlgebra, probably not to discourage students. XD.

particleonazock
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I'm almost 10 years late for your birthday party, sorry. Maybe invite me to your 50th?

Calthevin
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15 million people? more people than the entire population of the czech republic xD

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