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OpenStudy (anonymous):
Which of the following numbers is divisible by 3 and 9? A. 74,028 B. 40,653 C. 62,997 D. 95,376
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OpenStudy (math&ing001):
Well if it's divisible by 9 then it's automatically divisible by 3, because 3 divides 9. To test this there's a dirty trick: you add the digit of the number all together, and if the sum divisible by 9, then the whole number is divisible by 9.
OpenStudy (math&ing001):
Example : for 74,028 we sum up all the digits 7+4+0+2+8 = 21 21 is not divisible by 9 so 74,028 is not divisible by 9. Can you try for the second number ?
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