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Question 342514: I need to know how to name the set or sets of numbers that each real number belongs to. I don't really know how to classify it. How would I know if it is an integer, whole number, real number, rational or irrational number and what is a natural number? And I am using square roots with these so the first question is negative square root of 20. So how do I classify that? For my answer I put integer, rational, and real number, but I don't even know what they mean.
Answer by jim_thompson5910(35256)   (Show Source):
You can put this solution on YOUR website! The number  is a real number and it is an irrational number.
Here are some quick definitions:
Integer: Whole number (ie number with no decimal parts).
Natural number: Any whole number that is positive and not zero (eg: 1, 2, 3, 4...)
Rational Number: Number that can be written as a fraction of two integers.
Irrational Number: A number that CANNOT be written as a fraction of two integers.
Real Number: At the moment, it's pretty much any number you can think of. So every number is a real number (for now). You'll find on later in algebra that there are other types of numbers that are not real numbers.
If you need more help, email me at jim_thompson5910@hotmail.com
Also, please consider a making a donation at my website. Thanks.
Jim
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