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Q: How can you tell without dividing that a number is divisible by 8?

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just dividing it

If you can cut it in half three times and get a whole number each time, it's divisible by 8.

1. Sum of digits (12) is divisible by 3, so number is divisible by 3 2. It's an even number so it's divisible by 2 3. If it's divisible by both 3 and 2 then it's divisible by 3 x 2, ie 6.

If it ends with an even number then it is divisible by 2

To know if a number is composite without listing its factors, you can use these rules:All numbers that end with 2, 4, 6, 8, and 0 (even numbers) are divisible by 2.If the sum of the digits in a number is divisible by 3, the number is divisible by 3.If the last two digits are divisible by 4, the number is divisible by 4.All numbers that have 5 in the one's place are divisible by 5.If a number is divisible by 2 AND is divisible by 3, it is divisible by 6.If the last 3 digits of a number are divisible by 8, the number is divisible by 8.If the sum of the digits of number is divisible by 9, the number is divisible by 9.If a number ends wuth 0, the number is divisible by 10.

One quick way to tell whether or not a cell is dividing is to look at the number of chromosomes. If the number is doubled then it is dividing.

If it's divisible by 3 and 4, it's divisible by 12.

If it's even and divisible by 3, it's divisible by 6.

Divide the number by thirteen. If the answer comes out even with no remainder, the number is divisible by thirteen.

A number is divisible by 4 if the last two digits form a number that is divisible by 4, for example 612 is divisible by 4 (because 12 is divisible by 4).

if the last digit is even or 0, a number is divisible by 2!

If you know the rules of divisibility, you can tell if a number is divisible by another number by looking at it. A number is divisible... by 2 if it's even. by 3 if the sum of its digits is a multiple of 3. by 4 if the last two digits are a multiple of 4. by 5 if it ends in a 5 or 0. by 6 if it's divisible by 2 and 3. by 8 if the last three digits are divisible by 8. by 9 if the sum of its digits is a multiple of 9. by 10 if it ends in a 0. There is a rule for 7, but it's annoyingly complicated, hard to remember and takes as long to implement as actually dividing by 7.

A number is divisible by 4 if the last two digits form a number that is divisible by 4, e.g. 312 is divisible by 4 (because 12 is divisible by 4).

1- Any number is divisible by 1.2- Any even number is divisible by 2.3- If its digits add up to a number divisible by 3, the whole number is divisible by 3.4- If the last two digits are divisible by 4, the whole number is divisible by 4.5- If it ends in 5 or 0, the whole number is divisible by 5.6- If it's even and also divisible by 3, the whole number is divisible by 6.7- There is no rule for 7.8- If the last three digits are divisible by 8, the whole number is divisible by 8.9- If its digits add up to a number divisible by 9, the whole number is divisible by 9.10- If it ends in 0, the whole number is divisible by 10.divisibilty rules are how you times the number for instence if you want to find the divisibilty rule for 10 it would be the end number must be zero and then it would be a multiple of 10 and the divisibilty rule for 2 is the end number must be even then it would be a multiple of 2There are guidelines that exist to tell whether a number is divisible by another without having to perform the division. For example, if a number ends in 0 or 5, it is divisible by 5. That's the divisibility rule for 5.You can find out if a number is divisible by another by trial and error, that is, actually dividing it. If you know the divisibility rules, you can tell whether one number is divisible by another just by looking at it. For example, if a number is even, it's divisible by 2. If the sum of a number's digits adds up to a multiple of 3, the original number is divisible by 3. If a number ends in 0 or 5, it's divisible by 5.

A whole number is evenly divisible by 10 only if its last digit is a zero.

It ends in zero.

It's even.

You can tell if the sum of the digits can be divided by 3.

Being divisible by 4, means that it will also be divisible by 2, so that doesn't tell you anything about divisibility by 8. But if you divide the number by 2, and this quotient is divisible by 4, then yes the original number is divisible by 8.

If the number is divisible by 2 and 3, it can also be divided by 6.For example - 12126 is divisible by 2 and 3 and6Divide it by 6 and see if you get a whole number.

If the denominator has ANY prime factor other than 2 or 5, then the decimal is repeating.

If the digits of the number you're dividing by 3 add up to a multiple of 3, the whole number is divisible by 3 and there will be no remainder. If they don't add up to a multiple of 3, there will be a remainder.

No, this number is divisible by 3 and hence is not a prime number. You can tell that fast by adding the individual digits. If that sum is itself divisible by 3, as this one is, then the number itself is divisible by 3.

You can tell if the last 2 digits of the number can be divisible by 4 or 8. So the number 3156372856374856386578365864would be divisible by 8 because 8 can go into 64.

If the last two digits of a number are divisible by four, the whole number is divisible by four. This is related to the fact that 100 is a multiple of 4.For example, 12885212 is divisible by 4, because 12 is divisible by 4. No need to divide the entire number.

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