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Mathematics 21 Online
OpenStudy (anonymous):

Which of the following helps you to determine that two hundred seventy-nine is divisible by 9? seventy-nine is divisible by 9. 2 plus 7 plus 9 is divisible by 9. The last digit is a 9. 9 is divisible by 9.

OpenStudy (shamil98):

Option 1 is false.. 79/9 = is a decimal not a whole number.. Option B is my best guess.

OpenStudy (shamil98):

For example. 369 is divisible by 9 3 + 6 + 9 = 18 and 18 is divisible by 9

OpenStudy (anonymous):

THXS for the help

OpenStudy (pixiedust1):

In order to find if a number is divisible by 9, you must add up all the numbers, and see if they equal a number divisible by 9. For 79, you would add 7+9. Is 7+9 divisible by 9?

OpenStudy (pixiedust1):

So yes, B would be the correct answer

OpenStudy (pixiedust1):

Have a blessed day!

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