REAL NUMBERS

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# REAL NUMBERS - PowerPoint PPT Presentation

REAL NUMBERS. (as opposed to fake numbers?). Objective. TSW identify the parts of the Real Number System TSW define rational and irrational numbers TSW classify numbers as rational or irrational. Real Numbers. Real Numbers are every number.

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### REAL NUMBERS

(as opposed to fake numbers?)

Objective
• TSW identify the parts of the Real Number System
• TSW define rational and irrational numbers
• TSW classify numbers as rational or irrational
Real Numbers

Real Numbers are every number.

Therefore, any number that you can find on the number line.

Real Numbers have two categories.

What does it Mean?
• The number line goes on forever.
• Every point on the line is a REAL number.
• There are no gaps on the number line.
• Between the whole numbers and the fractions there are numbers that are decimals but they don’t terminate and are not recurring decimals. They go on forever.
Real Numbers

REAL NUMBERS

154,769,852,354

1.333

-5,632.1010101256849765…

-8

61

π

49%

549.23789

Two Kinds of Real Numbers
• Rational Numbers
• Irrational Numbers
Rational Numbers
• A rational number is a real number that can be written as a fraction.
• A rational number written in decimal form is terminating or repeating.
16

1/2

3.56

-8

1.3333…

- 3/4

Examples of Rational Numbers

### Integers

One of the subsets of rational numbers

What are integers?
• Integers are the whole numbers and their opposites.
• Examples of integers are

6

-12

0

186

-934

Types of Integers
• Natural Numbers(N): Natural Numbers are counting numbers from 1,2,3,4,5,................N = {1,2,3,4,5,................}
• Whole Numbers (W): Whole numbers are natural numbers including zero. They are 0,1,2,3,4,5,...............W = {0,1,2,3,4,5,..............} W = 0 + N

REAL NUMBERS

NATURAL

Numbers

WHOLE

Numbers

IRRATIONAL

Numbers

INTEGERS

RATIONAL

Numbers

Irrational Numbers
• An irrational number is a number that cannot be written as a fraction of two integers.
• Irrational numbers written as decimals are non-terminating and non-repeating.

Caution!

A repeating decimal may not appear to repeat on a calculator, because calculators show a finite number of digits.

Irrational numberscan be written only as decimals that do not terminate or repeat. They cannot be written as the quotient of two integers. If a whole number is not a perfect square, then its square root is an irrational number.

Try this!

a) Irrational

b) Irrational

c) Rational

d) Rational

e) Irrational

16 2

4 2

= = 2

Additional Example 1: Classifying Real Numbers

Write all classifications that apply to each number.

A.

5 is a whole number that is not a perfect square.

5

irrational, real

B.

–12.75

–12.75 is a terminating decimal.

rational, real

16 2

C.

whole, integer, rational, real

A fraction with a denominator of 0 is undefined because you cannot divide by zero. So it is not a number at all.

0 3

= 0

Additional Example 2: Determining the Classification of All Numbers

State if each number is rational, irrational, or not a real number.

A.

21

irrational

0 3

B.

rational

State if each number is rational, irrational, or not a real number.

4 0

C.

not a real number

Objective
• TSW compare rational and irrational numbers
• TSW order rational and irrational numbers on a number line
Comparing Rational and Irrational Numbers
• When comparing different forms of rational and irrational numbers, convert the numbers to the same form.

Compare -3 and -3.571

(convert -3 to -3.428571…

-3.428571… > -3.571

3

7

3

7

Ordering Rational and Irrational Numbers
• To order rational and irrational numbers, convert all of the numbers to the same form.
• You can also find the approximate locations of rational and irrational numbers on a number line.
Example
• Order these numbers from least to greatest.

¹/₄, 75%, .04, 10%, ⁹/₇

¹/₄ becomes 0.25

75% becomes 0.75

0.04 stays 0.04

10% becomes 0.10

⁹/₇ becomes 1.2857142…

Answer: 0.04, 10%, ¹/₄, 75%, ⁹/₇

Practice

Order these from least to greatest: