Real Numbers - Lesson
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The Real Number System is made up of
all the points on the number line.
Book Worm 
Real Numbers are either integers, rational or irrational
(These are the subsets of the real number system.)

Since integers can be written in fractional form,
integers can also be considered rational numbers.

 

Number Line

The numbers shown here represent both
rational and irrational numbers.

The integer, -2, is a rational number.

The decimal number 0.5 is also a rational number.

Pi (Pi symbol) (Approximately symbol3.14) is a decimal number that, to our knowledge, has no end and cannot be expressed as a ratio of two integers.  Therefore it is an
irrational number.


Geeky girl
Repeating decimals are also rational numbers.
Take for example the repeating decimal

This can be expressed as a ratio of two integers as

 

Let's Practice!

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Topic Index | Grade 7 Math | Intermediate Test Prep | StudyZone

Created by Sarah Therrien
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