A Divisibility rules is a shorthand way of determining whether a given integer
is divisible by a fixed divisor without performing the division, usually by examining its digits.
The first step in the divisibility rules for 3 and 9 is to sum all of the digits in the number
and a number that is divisible by 2 and 3 is also divisible by 6.
Put a check under each corresponding column to identify whether each given
number is exactly divisible by 3, 6 or 9.
3
6.
9
39
93
540
1245
8710
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