Is it normal that i don't understand prime numbers?

I have never understood prime numbers since 4th grade. And now my daughter is asking me to help her with prime numbers. I just said ask grandma she'll help you. I want to help my daughter but I don't understand! Does anyone know how prime numbers work???

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40%Β Normal
Based on 5 votes (2 yes)
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Comments ( 16 )
  • paramore93

    A prime number is any number bigger than 1 that can't be made by multiplying other numbers.
    So 11 is a prime because you can't make 11 by multiplying any whole numbers.
    10 wouldn't be a prime because 5x2 = 10 ..

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    • edwininthematrix

      Technically you are correct but the way I prefer to think of it is that the only way to reach a prime number is by multiplying itself by one. for example, 13 x 1 =13

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      • But multiplying a number by one would equal the same number. I get it now though.

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    • Oh thank you! That makes a lot of sense!

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      • You can officially be promoted into 5th grade in June. Congrats!

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        • :( Are you making fun of me? :(

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          • Nah, just teasing. ;)

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            • πŸ˜Άβ˜ΉοΈπŸ™πŸ˜•πŸ˜πŸ™‚πŸ˜œ

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  • To find out if a number is prime all you need to do is find the square root of the nearest square number, then check if any numbers up to that root number go into your number, if not then the number you are checking is prime example: if you wanted to find out if 61 is prime the nearest square number is 64 (8X8=64) so 8 is the square root of 64 so you check all numbers up to 8
    ignore 1 it doesn't count
    2,4,6 & 8 are all even you can't divide an even into an odd
    It doesn't end in 0 or 5 so can't be divided by 5
    The components of the original number (6 & 1) don't add up to a number in the 3 times table so 3 doesn't go either
    you only got to check the number 7
    If you know your tables you will know 61 is not in 7 times table
    Therefore 61 is prime.
    Easy

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    • I mean that does make sense.

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  • Ummitsme

    Just remember 51 isn't prime and you'll be okay.

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    • Umm. Ok.

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  • oscar_mayflower

    2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, etc.

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    • OK.

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  • It's simple really a prime number is a number that can only be divided by 2 numbers, those numbers are 1 and itself. 1 is not a prime number as it can only be divided by 1 number (itself). 2 is the only even prime number as all other even numbers can be divided by 1,2 and itself (and usually some other numbers as well) so they can be divided by at least 3 numbers.

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    • Ok. Thank you a hole lot!!!!!!!😜

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