00:01
So let's start with number one here.
00:01
We want to circle the letter of the correct answer.
00:04
So number says what number below is natural, whole, an integer, irrational, and real.
00:09
Well, let's start with the first one, a real number.
00:12
Real numbers are basically anything that's not imaginary, which means they wouldn't be a real number.
00:17
And all of these numbers are real numbers.
00:20
So this would still be true for everything.
00:22
Now, a rational number, that's any number that can be written as a fraction.
00:26
Well, we can write negative four as a fraction by putting it over one.
00:29
Same thing with three.
00:31
0 .7.
00:31
Think about how you'd actually say that.
00:33
That's really 7 tenths.
00:35
So it can be written as a fraction.
00:36
The same idea with 5 .1.
00:38
That would be 5 in 1 tenth.
00:40
So that can be written as a fraction as well.
00:42
So they're all rational.
00:44
Now, for an integer, that's any number that you would put on your regular number line.
00:48
Basically, it can be positive, negative, or 0.
00:51
It just can't be a fraction or decimal.
00:53
Therefore, 0 .7 and 5 .1 are up.
00:57
Then i'll go to a whole number.
00:58
A whole number is, again, no decimals, no fractions.
01:02
It could be zero or it could be positive.
01:04
Well, it can't be negative 4 because that would be a negative number.
01:08
So our answer really are left with is 3.
01:12
All right.
01:12
Now let's take a look at number 2.
01:14
It says which of the following is always true.
01:16
First off, all integers are whole numbers.
01:19
Well, remember, integers are positive and negative whole numbers.
01:22
So not every integer is, or sorry, not every integer is a whole number.
01:27
Therefore, a cannot be true.
01:30
Now, excuse me, i should have said that should be e.
01:33
Now, let's look at f.
01:34
Some whole numbers are not rational.
01:37
Well, that's not true, because to make any whole number rational, we can always put it over one.
01:41
So therefore, f is not our answer as well...