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How could you adapt the rule for division by 3 to decide easily when a number is divisible by 9?
Updated: 9/18/2023
Just add up the digits and if that sum is divisible by 9 then the original number is divisible by 9.
Example 729 = 7+2+9 = 18 (18 is divisible by 9 therefore 729 is divisible by 9)
123456789 = 1+2+3+4+5+6+7+8+9 = 45 (45 is divisible by 9 therefore 123456789 is divisible by 9)
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A number is divisible by another when the BLANK after division by that number is 0?
A number is divisible by another when the remainder after division by that number is zero.
A number is divisible by another number when the after division by the number is 0?
... when the remainder after division ...
A number is divisible by another?
A number is divisible by another when the remainder of the division is zero.
Is a number divisible by another when the after division number is 0?
No its not
How do you find out if a number is divisible by something?
Do the division and if the remainder is 0 then the number is divisible by the something and if not it isn't.
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