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bmwhype2
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What is the quick litmus test to see whether an integer is 26 Oct 2007, 09:48
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What is the quick litmus test to see whether an integer is divisible by 7



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What is the quick litmus test to see whether an integer is 26 Oct 2007, 12:37
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bmwhype2
What is the quick litmus test to see whether an integer is divisible by 7
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No rules that I know of.
Prime factorization? Or just divide by 7, shouldn't take that long...
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bmwhype2
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What is the quick litmus test to see whether an integer is 26 Oct 2007, 12:39
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bmwhype2
What is the quick litmus test to see whether an integer is divisible by 7

No rules that I know of.
Prime factorization? Or just divide by 7, shouldn't take that long...
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I came across several questions that asked this concept.


is 342234234123 divisible by 7? lol
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KillerSquirrel
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What is the quick litmus test to see whether an integer is 26 Oct 2007, 12:50
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bkk145
bmwhype2
What is the quick litmus test to see whether an integer is divisible by 7

No rules that I know of.
Prime factorization? Or just divide by 7, shouldn't take that long...

I came across several questions that asked this concept.


is 342,234,234,123 divisible by 7? lol
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I use approximation

since ---> 7*4 = 28 ---> then:

342,234,234,123 - 280,000,000,000 = 62,234,234,123

7*8 = 56

62,234,234,123 - 56,000,000,000 = 6,234,234,123

6,234,234,123 - 5,600,000,000 = 634,234,123

634,234,123 - 560,000,000 = 74,234,123

7*10 = 70

74,234,123 - 70,000,000 = 4,234,123

7*6 = 42

4,234,123 - 4,200,000 = 34,123

34,123 - 28,000 = 6,123

6,123 - 5,600 = 523

523 - 490 = 33

this number dosen't divide by 7 !

:)
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What is the quick litmus test to see whether an integer is 26 Oct 2007, 13:19
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bkk145
bmwhype2
What is the quick litmus test to see whether an integer is divisible by 7

No rules that I know of.
Prime factorization? Or just divide by 7, shouldn't take that long...

I came across several questions that asked this concept.


is 342234234123 divisible by 7? lol
Show more


I would just divide that number by 7. Should take about 20 seconds max.
Do you have an actual problem?



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Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
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