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No. If it is not divisible by 2 it cannot be divisible by 8, so don'y bother.

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โˆ™ 2010-08-30 13:31:04
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Q: Is there a need to test for divisibility by 8 if the number is not divisible by 2?
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Related questions

What is the test of divisibility for 6?

A number is divisible by 6 if the number is divisible by 2 AND 3.


How can you test for the divisibility by 6?

If the number is also divisible by 2 and 3


What is the algorithm for prime numbers in c?

Here is a very simple algorithm: Call your number "n". You might test divisibility by every number, starting at 2. If the first number by which a number is divisible is equal to "n", then it is a prime number. - Faster algorithms are possible; for example, you really only need to test divisibility by all numbers, up to the square root of your number "n".Here is a very simple algorithm: Call your number "n". You might test divisibility by every number, starting at 2. If the first number by which a number is divisible is equal to "n", then it is a prime number. - Faster algorithms are possible; for example, you really only need to test divisibility by all numbers, up to the square root of your number "n".Here is a very simple algorithm: Call your number "n". You might test divisibility by every number, starting at 2. If the first number by which a number is divisible is equal to "n", then it is a prime number. - Faster algorithms are possible; for example, you really only need to test divisibility by all numbers, up to the square root of your number "n".Here is a very simple algorithm: Call your number "n". You might test divisibility by every number, starting at 2. If the first number by which a number is divisible is equal to "n", then it is a prime number. - Faster algorithms are possible; for example, you really only need to test divisibility by all numbers, up to the square root of your number "n".


What is divisibility test rule for 12?

If a number is divisible by both three and four, it's divisible by twelve.


How do you know if a number can be divisible by 36?

It's very easy to test a number to see if it is divisible by 4 or by 9. If it passes both tests, then it is divisible by 4x9=36.To test for divisibility by 9, add the digits of the number. If the sum is divisible by 9, then the number is divisible by 9.To test for divisibility by 4, look at the last two digits. If they are a multiple of 4, then the number is divisible by 4.


What are the 20 divisibility test?

To test divisibility for 20, you need to use the tests for divisibility by 4 and 5.The test for divisibility by 4 is that the last 2 digits of the number, given as a 2-digit number, are divisible by 4.Example for 4:We are testing the number 11042.42/4 = 10.5 which is not a whole number. Therefore 11042 is not divisible by 4.The test for divisibility by 5 is that the last digit of the number is either 5 or 0.


Is 2452 divisible by 3 or divisible by 4?

Divisibility test for 3 : the sum of digits of the given number must be a multiple of 3 Divisibility test for 4 : the number formed by last 2 digits must be a multiple of 4.


How do you figure out prime numbers?

You try if the number is divisible by any smaller number (except one). If it isn't, it is a prime number. In practice, it is enough to test divisibility by factors up to the square root of the number.You try if the number is divisible by any smaller number (except one). If it isn't, it is a prime number. In practice, it is enough to test divisibility by factors up to the square root of the number.You try if the number is divisible by any smaller number (except one). If it isn't, it is a prime number. In practice, it is enough to test divisibility by factors up to the square root of the number.You try if the number is divisible by any smaller number (except one). If it isn't, it is a prime number. In practice, it is enough to test divisibility by factors up to the square root of the number.


What is the test for divisibility by 3?

If the digits of the number add up to a multiple of 3, the whole number is divisible by 3.


How do you test to see if a number is divisible by 12?

You could combine the tests for divisibility by 3 and 4. To test for divisibility by three, add all the digits together and see if they're divisible by three. If necessary, you can keep repeating the addition until you come up with a single-digit number. To test for divisibility by four, take the last two digits. If that two-digit number is divisible by four, then the whole number is. This is because any multiple of 100 is divisible by 4, so only the last two digits matter. Combined, these two tests will allow you to quickly check for divisibility by 12.


Is 5890 divisible by 2 3 6 9 5 10?

Test of divisibility by 2:If a number is even then the number can be evenly divided by 2.5890 is an even number so, it is divisible by 2.Test of divisibility by 3:A number is divisible by 3 if the sum of digits of the number is a multiple of 3.Sum of digits = 5+8+9+0 = 22, which is not a multiple of 3.So, 5890 is not divisible by 3.Test of divisibility by 6:In order to check if a number is divisible by 6, we have to check if it is divisible by both 2 and 3 because 6 = 2x3.As we have seen above that 5890 is not divisible by 3 so, 5890 fails to pass the divisibility test by 6.Test of divisibility by 9:If the sum of digits of a number is divisible by 9 then the number is divisible by 9.Sum of digits = 5+8+9+0 = 22, which is not a multiple of 9.So, 5890 is not divisible by 9.Test of divisibility by 5:If the last digit of a number is 0 or 5, then it is divisible by 5.It is clear that 5890 is divisible by 5.Test of divisibility by 10:If the last digit of a number is 0, then the number is divisible by 10.It is clear that 5890 is divisible by 10 as the last digit is 0.


Divisibility of 7623?

7623 is divisible by 3.Test of divisibility by 3:Sum of digits of 7623 = 7+6+2+3 = 18, which is a multiple of 3, so the number is divisible by 3.If sum of the digits of a number is a multiple of 9 then it is divisible by 9.So, 7623 is also divisible by 9.Therefore, test of divisibility can help a lot in determining whether a number is divisible by any other number.


What is the divisibility test for 15?

It is divisibility by 3 and divisibility by 5.Divisibility by 3: the digital root of an integer is obtained by adding together all the digits in the integer, with the process repeated if required. If the final result is 3, 6 or 9, then the integer is divisible by 3.Divisibility by 5: the integer ends in 0 or 5.


How do you know when is a prime number?

The definition of a prime number is an integer, greater than one, that is divisible only by one and itself. Instead of trying out divisibility by ALL smaller numbers, it is enough to divide by numbers up the the square root of the number you are testing. Also, you don't need to test division by even numbers (except by 2). Thus, for example, for any number smaller than 121 (11 squared), it is enough to test divisibility by 2, 3, 5, and 7. If your number is not divisible by any of these, it is a prime number. For larger numbers, you need to test divisibility by more numbers (up to the square root of the number being tested); for very large numbers, more efficient tests exist.


What makes a number divisible by 18?

The formal answer is that 18 goes into the number without remainder. A simple test for divisibility by 18 is as follows: (a) the number must be even. (b) the sum of all the digits of the number must be divisible by 9. (a) ensures the number is divisible by 2 and (b) that it is divisible by 9. So, together they ensure divisibility by 2*9 = 18. Note that (b) only works with 3 and 9.


What is the divisibility of 3?

Add the digits of the number together and if the sum is divisible by 3 then the original number is divisible by 3. The test can be applied to the sum and so the summation can be repeated until a single digit remains; if this digit is 3, 6 or 9 then the original number is divisible by 3.


How can the divisibility rules help find prime factorization?

You can test successive prime numbers to see if your number is divisible by them, but knowing the divisibility rules will help you eliminate some steps, depending on what your number is. If your number is odd, you don't have to test for 2. If the sum of your number's digits do not total a multiple of 3, you don't have to test for 3. If your number doesn't end in a 5 or 0, you don't have to test for 5. Just by looking at your number, you can include or eliminate the three most common primes if you know the rules of divisibility.


Is 21021 a prime number?

21021 is not a prime number because it has more than two factors. 21021 is also divisible by 3, which can be checked by using test of divisibility:Sum of digits of 21021 = 2+1+0+2+1 = 6(a multiple of 3)and this means that 21021 is divisible by 3.Test of divisibility helps a lot for a number like 21021.


What is 8487 divisibility rule?

The number must be divisible by 9, 23 and 41, so all three of the following conditions must be met.Divisibility by 9 requires you to check the sum of the digits is divisible by 9.Divisibility by 23 requires you to add 7 times the last digit to the rest. The answer must be divisible by 23 directly.For divisibility by 41, subtract 4 times the last digit from the rest. The answer must be divisible by 23 directly.In each case, the additions or subtractions can be repeated so as to make the answer easier to test for divisibility.


Can 612 divisible by 4?

612 is divisible by 4. To test divisibility by 4, if the last 2 digits of the number are divisible by 4, then the whole number is divisible by 4. Last 2 digits of 612 are 12, and 12 is divisible by 4 since 3x4 = 12, so 612 is divisible by 4. 612 / 4 = 153.


What numbers are not divisible by 9?

There an infinity of such numbers. One test for divisibility by 9 depends on the digital root. The digital root of any number is the sum of all its digits. If the digital root of a number (or the digital root of its digital root) is divisible by 9 then the original number is, and if the DR is not then the original number is not.


Which number has no test for divisibility?

Every number has a test for divisibility. The issue is that the tests get more complicated as the divisor increases. For primes up to 50, see either of the attached links.


Is 5673 divisible by 3 or 9?

It is divisible by 3 but not divisible by 9. To test for divisibility by 3, sum the digits and if the sum is divisible by 3 then so is the original number; the test can be repeated ion the sum, so keep summing until a single digit remains and if this single digit is 3, 6 or 9, then the original number is divisible by 3: 5673 → 5 + 6 + 7 + 3 = 21 → 2 + 1 = 3 which is one of {3, 6, 9} so 5673 is divisible by 3. To test for divisibility by 9, sum the digits and if the sum is divisible by 9 then so is the original number; the test can be repeated ion the sum, so keep summing until a single digit remains(this single digit is known as the digital root of the number) and if this single digit is 9, then the original number is divisible by 9: 5673 → 5 + 6 + 7 + 3 = 21 → 2 + 1 = 3 which is not 9 so 5673 is not divisible by 9.


What is 30 divisible by using the divisibility test?

1, 2, 3, 5, 6, 10, 15, 30


What is the divisible test for the number 6?

6 = 2 x 3So it must satisfy the divisibility tests for both 2 and 3, namely:Any even number for which the sum of its digits is divisible by 3.

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