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Question
Test the divisibility of the following number by 3:
872645
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Solution
A number is divisible by 3 if the sum of its digits is divisible by 3.
872645 is not divisible by 3 because the sum of its digits, 8+7+2+6+4+5, is 32, which is not divisible by 3.
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Which of the following is a prime number?
Using divisibility tests, determine which of the following numbers are divisible by 2; by 3; by 4; by 5; by 6; by 8; by 9; by 10; by 11 (say, yes or no):
|
Number |
Divisible by |
||||||||
|
2 |
3 |
4 |
5 |
6 |
8 |
9 |
10 |
11 |
|
|
128 |
Yes |
No |
Yes |
No |
No |
Yes |
No |
No |
No |
|
990 |
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|
1586 |
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|
275 |
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|
6686 |
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|
639210 |
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|
429714 |
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|
2856 |
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|
3060 |
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|
406839 |
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Which of the following divisibility rules is based on the sum of digits?
