00:01
Okay, here we're trying to find out which elements belong to which sets.
00:06
So we start with a set of natural numbers.
00:08
And these are going to be all your numbers that, the way you would naturally start counting.
00:15
One, two, three, four.
00:17
So the only natural number we have is going to be six.
00:27
Then whole numbers are all your natural numbers, including zero.
00:34
So again, we only have six.
00:38
And yours are going to be all the whole numbers.
00:41
Numbers, natural numbers, whole numbers, including negative numbers.
00:47
So this is going to be negative 12 and 6.
00:54
All right.
00:55
And then the irrational numbers, i'm sorry, rational numbers are going to be all of your integers, including any decimals that repeat and stop.
01:12
So we know we have negative 12 and 6 automatically.
01:26
And then you want to look at, if you'll notice i've calculated the square root of five, to see what its decimal looks like.
01:39
So since we have 2 .23606 and it just keeps on rambling on, this is not going to be irrational...