# Fundamental Math

• Nov 30th 2012, 12:48 PM
asilvester635
Fundamental Math
How did he get his answer 0.51???
• Nov 30th 2012, 12:52 PM
MarkFL
Re: Fundamental Math
It is a typo, the choice should be 0.26.
• Nov 30th 2012, 01:13 PM
asilvester635
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"
• Nov 30th 2012, 01:15 PM
MarkFL
Re: Fundamental Math
15 isn't prime, as it is divisible by 3 and 5.
• Nov 30th 2012, 01:18 PM
asilvester635
Re: Fundamental Math
lol i guess another typo... thanks
• Nov 30th 2012, 01:19 PM
Plato
Re: Fundamental Math
Quote:

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?
• Nov 30th 2012, 01:41 PM
asilvester635
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
• Nov 30th 2012, 01:47 PM
HallsofIvy
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.
• Nov 30th 2012, 05:15 PM
asilvester635
Re: Fundamental Math
so can we say that 12 is a multiple of 2??
• Nov 30th 2012, 05:16 PM
asilvester635
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?
• Nov 30th 2012, 05:19 PM
asilvester635
Re: Fundamental Math
never mind i get it lol thanks