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A number that is divisible by 15 is divisible both by 5 and 3

A number is divisible by 5 if it ends with 0 or 5

A number is divisible by 3 if the sum of its digits is divisible by 3

e.g. 4035 is divisible by 15 as it ends with a 5 and 4+0+3+5=12 which is divisible by 3

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โˆ™ 2012-09-25 19:55:14
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Q: How do you know that a number is divisible by 15?
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The smallest number that is divisible by 20 and 15 is 60.


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If a number is divisible by 3 and 5, it is divisible by 15.


Can you write a number that is divisible by 3 but not divisible by 6?

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Is a number that is divisible by 3 and 10 always divisible by 15?

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What is divisibility rule of 15?

A number is divisible by 15 if it is divisible by the prime factors of 15, that is, 5 and 3.


How do you know if the number is divisible by 15?

All numbers divisible by 5 (of which 15 is a multiple) have a final digit of 0 or 5. All numbers divisible by 3 (of which 15 is a multiple) have the sum of the digits totalling 3 or a multiple of 3. Therefore, a number is divisible by 15 if the sum of its digits total 3 or a multiple of 3 and its final digit is 0 or 5. Example : 32085 ; 3 + 2 + 0 + 8 + 5 = 18 which is divisible by 3. Final digit 5. This number is divisible by 15. (32085 ÷ 15 = 2139) 7420 : 7 + 4 + 2 + 0 = 13. This number is not divisible by 15.


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