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19 Jun 2010, 19:13
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is there any easy method especially when dealing with big numbers?
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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.
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whiplash2411
Joined: 09 Jun 2010
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20 Jun 2010, 22:23
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There are specific rules to remember divisibility by numbers up to 10.
1: All numbers
2: Even numbers
3: Sum of digits = 3
4: Divisible by 2 twice/Last two digits divisible by 4
5: Last digit = 5 or 0
6: Divisible by 3 and 2
7: No divisibility rule
8: Divisible by 2 thrice/last three digits divisible by 8
9: Sum of digits = 9
10: Last digit = 0
Now for bigger numbers, what you basically need to do is assume they are divisible and check for consistency with constrains given in the problem.
For example if a question asks if a number x is divisible by 12 and gives you additional constraints say:
x = 12a
And then check against restrictions. But I'd say that beyond this the method would be case specific. Hope this helps!
1: All numbers
2: Even numbers
3: Sum of digits = 3
4: Divisible by 2 twice/Last two digits divisible by 4
5: Last digit = 5 or 0
6: Divisible by 3 and 2
7: No divisibility rule
8: Divisible by 2 thrice/last three digits divisible by 8
9: Sum of digits = 9
10: Last digit = 0
Now for bigger numbers, what you basically need to do is assume they are divisible and check for consistency with constrains given in the problem.
For example if a question asks if a number x is divisible by 12 and gives you additional constraints say:
x = 12a
And then check against restrictions. But I'd say that beyond this the method would be case specific. Hope this helps!
20 Jun 2010, 22:28
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sriharshagaruda
You have an example perhaps?
Archived Topic
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
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
