# Thread: Fundamental Math

1. ## Fundamental Math

How did he get his answer 0.51???

2. ## Re: Fundamental Math

It is a typo, the choice should be 0.26.

3. ## Re: Fundamental Math

another question, why is 15 a prime number? isn't it divisible by 3? and the definition for prime number is "Divisible by ONLY itself AND 1"

4. ## Re: Fundamental Math

15 isn't prime, as it is divisible by 3 and 5.

5. ## Re: Fundamental Math

lol i guess another typo... thanks

6. ## Re: Fundamental Math

Originally Posted by asilvester635
the definition for prime number is "Divisible by ONLY itself AND 1"
If that were the definition of prime number, would that not mean that 1 is a prime number?

7. ## Re: Fundamental Math

Can anyone explain this better to me???? I don't exactly grasp this concept...

Topic: Multiple
Definition: Number multiplied by an integer
Example: The first multiple of 6 is 6, then 12

8. ## Re: Fundamental Math

"A is a multiple of B", where A and B are integers, means that there exist some integer C such that A= BC.

6 is a multiple of 6 because it is equal to 1(6). That is, C= 1. 12 is multiple of 6 because 12= (6)(2). It is the "1" and "2" that causes them to say "first" multiple and "then". The next few multiples are 3(6)= 18, 4(6)= 24, 5(6)= 30, etc.

9. ## Re: Fundamental Math

so can we say that 12 is a multiple of 2??

10. ## Re: Fundamental Math

and can we also way that 12 is a multiple of 12 because it is equal to 1(12). That is, c= 1?

11. ## Re: Fundamental Math

never mind i get it lol thanks