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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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Related questions

What is divisibility rules for 15?

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


What number is 663 divisible?

663 is divisible by i dont know . but i do know that it can not be a even number so it has to be divisible by a odd number


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

15


What is the division rule for 15?

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


What is the smallest number that is divisible by 20 and 15?

The smallest number that is divisible by 20 and 15 is 60.


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.


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.


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

no as 2 does not go into 15


What is the divisiblity rule for 15?

A number is divisible by 15 if it is divisible by 5, and by 3. For example, 165 is divisible by 15, since it ends in 5, and the sum of its digits is divisible by 3.


Why is 15 not a prime number?

15 is not a prime number because it is not only divisible by 1 and itself it is also divisible by 3.


What is the number that is divisible by 1-15?

16


What number is divisible by 15 and also divisible by 9 What is the smallest possible number?

45


What is the largest numbers can be divisible by 3 and 5?

There is no such number. If you have any such number, n, that is divisible by 3 and 5 then n + 15 is larger, and is divisible by both. And you can add another 15 to that number, and then to that, for ever more.


Is 527 divisible by 3?

No.A very quick way to know whether or not a number is divisible by is adding up the numbers within the number. And see if the new number is divisible by 3.For instance, the number 527, add 5, 2, and 7 together. (5+2+7=14) The answer, 14, is not divisible by 3.Another example would be the number 168. 1+6+8=15 The number 15 is divisible by 3, therefore the number 168 is divisible by 3.


How do you know if a number is a multiples of 3?

If, when divided by 3, it leaves no remainder. Also, if you add the individual numbers up and that number is divisible by three, the larger one is as well. Example: 12345 adds up to 15. 15 is divisible by three. So is 12345.


How do you know a number is divisible by 6?

the number will also be divisible by 3 and 2


How do you know that a number is divisible by 2?

If a number is even, it's divisible by two.


A number is divisible by 6 if and only if it is divisible by 3?

If this is a T-F question, the answer is false. It is true that if a number is divisible by 6, it also divisible by 3. This is true because 6 is divisible by 3. However, the converse -- If a number is divisible by 3, it is divisible by 6, is false. A counterexample is 15. 15 is divisible by 3, but not by 6. It becomes clearer if you split the question into its two parts. A number is divisible by 6 if it is divisible by 3? False. It must also be divisible by 2. A number is divisible by 6 only if it is divisible by 3? True.


How do you know a whole number is divisible by nineteen?

Divide the number by nineteen. If the answer is a whole number, then the number is divisible.


How do you know if a number is divisible by 5?

If a number ends in 5 or 0, that number is divisible by 5.


What is a number divisible by 3 and 5 but not 9?

15


What number is divisible by 15?

30


A number divisible by both 3 and 5?

15


All numbers divisible by both 4 and 15 are also divisible by what numbers?

a number is 6. All numbers divisible by both 4 and 15 are the multiples of 4 and 15. Since 4 and 15 have no prime factor in common (4 = 22, 15 = 3 · 5), then the least common multiple of 4 and 15 is equal to their product, namely 4 · 15 = 60. Every other multiple of 4 and 15 is divisible by 60. Thus, if 60 is divisible by a number then all the multiples of 4 and 15 are divisible by that number. Therefore, it is enough to check by which number in the given options is 60 divisible. Only 6 divides 60 and none of the other do. The answer must be (A).


What is a number divisible by 3 3 and 5?

15 is divisible by 3 and 5.