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Mathematics 24 Online
OpenStudy (anonymous):

is 390 divisiblr by 3

OpenStudy (anonymous):

yes 3+9+0=12

OpenStudy (anonymous):

Yes. 390 / 3 = 130

OpenStudy (phi):

Here is a list of divisibility rules (they are handy to know, if you bother to learn them) https://en.wikipedia.org/wiki/Divisibility_rule#Divisibility_rules_for_numbers_1.E2.80.9320 at least for the first few numbers

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