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You can tell how many factors a number has from the prime factorization by adding one to the exponents and multiplying them. The prime factorization of 30 is 2 x 3 x 5 which is actually 2^1 x 3^1 x 5^1. Adding one to the exponents gives you 2 x 2 x 2. 30 has eight factors.

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Q: How do you know when you've found all the factors of a number 30?

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All of the factors are prime.

All of the factors are prime.

No, an odd number can have any number of factors. There is no limit but you do know that the number 2 is not one of those factors.

It's a perfect square.

Divisibility rules help you find the factors of a number. Once you've found the factors for two or more numbers, you can find what they have in common. Take 231 and 321. If you know the divisibility rules, you know that they are both divisible by 3, so 3 is a common factor.

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How to know that you found all the factors for example my teacher taught me that when u reach a double diget number that is all the factors. ( 6x6)-~ double diget number

If you multiply all the prime factors you've found together and the result is the number, you have found all of them.

When all the factors are prime.

All of the factors are prime.

All of the factors are prime.

When each one of them is a prime.

List them all, and multiply to see if you get the original number.

First to be able to find an abundant number you have find all the factors of any number. Then add them all up. If the total is bigger than the number you found out the factors of then it is an abundant number and if the total is less than the number you found out the factors for it is a deficiant number and finally if the total is the same number as the one you found out the factors for it is called a perfect number. Thanks for learning from me. I hope you have understood what i have typed. Bye!

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To know that a number is prime you need to know that it has no factors other than 1 and the number itself.To know that a number is composite you only need to know one factor other than the number itself or 1.

You don't.If you know just one factor, other than 1 and the number itself, you will know that the number is composite.A prime has only two factors: 1 and itself. So all the factors is no big deal.

No, an odd number can have any number of factors. There is no limit but you do know that the number 2 is not one of those factors.