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### 1.1 real number system dfs

• 1. Chapter I Algebra Review MATH-020 Dr. Farhana Shaheen 3/3/2017 1
• 2. Chapter I Algebra Review 1. The Real Number System 2. Sets 3. Inequality & Interval Notation 4. Integer Exponents 5. Ratios, Proportions, and Percentages 6. Simple and Compound Interest
• 3. 1.1 Real Number System 3/3/2017 3
• 5. Who invented number systems? • The Mayans according to historians are first who invented the number systems 3400 BC. 5
• 6. Tally Marks: Numerals used for counting 6
• 7. • After them independently Egyptians around 3100 BC invented their numeral system. 7
• 9. The Universal Numerals • The Universal Numerals are the numbers we use today! • Note that each Numeral has the number of angles equal to the number it represents. 9
• 10. How were numbers invented? 10
• 11. STORY OF NUMBERS • The story of numbers begins with • Natural numbers N= {1, 2, 3, 4, 5, ……} • Whole Numbers W = {0, 1, 2, 3, 4, 5, ……} • Integers Z= {-3, -2, -1, 0,1, 2, 3, 4, 5, ……} • Rational Numbers Q = {a/b: a,b are Integers} • Irrational Numbers Q’ = { ? } • Real Numbers= All Q and Q’ 11 3/3/2017
• 12. Number Line • A Number Line is used to arrange all numbers along a line. The points on the right are greater than the points on the left. The numbers on the Number Line are infinite, meaning they never end and keep increasing. 3/3/2017 12
• 13. Natural Numbers The story of numbers begin with Natural Numbers, also known as Counting Numbers, which consist of 1, 2, 3, 4, 5, 6… • These numbers are infinite, that is, they go on forever • Counting numbers do not contain 0, as the number “0” cannot be “counted” 3/3/2017 13
• 14. Whole Numbers • Whole Numbers : are natural numbers, but they also contain the number “0” • They consist of 0, 1, 2, 3, 4, 5, 6…. and so on. • Note that Whole Numbers do Not contain Fractions like 2/3, 4/7 etc. 3/3/2017 14
• 15. Natural Numbers/ Whole Numbers • Natural Numbers are also known as Counting Numbers, which consist of 1, 2, 3, 4, 5, 6… • These numbers are infinite, that is, they go on forever • Counting numbers do not contain 0, as the number “0” cannot be “counted”. • Whole Numbers are natural numbers, but they also contain the number “0” • They consist of 0, 1, 2, 3, 4, 5, 6…. and so on 3/3/2017 15
• 16. Integers • Integers are just like Whole Numbers; however, they contain negative numbers as well. • Negative Numbers are numbers smaller than 0. • Just like Whole Numbers, Integers do not contain Fractions. • Examples: -8, -5, 0, 4, 17, 23 3/3/2017 16
• 17. INTEGERS • A Number Line is used to arrange all numbers along a line. The points on the right are greater than the points on the left. The numbers on the Number Line are infinite, meaning they never end and keep increasing. 3/3/2017 17
• 18. • Integers = { ..., -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, ... } • Positive Integers = { 1, 2, 3, 4, 5, ... } = Natural Numbers • Negative Integers = { ..., -5, -4, -3, -2, -1 } • Non-Negative Integers = { 0, 1, 2, 3, 4, 5, ... } = Whole Numbers 3/3/2017 18
• 19. Adding and subtracting Integers • 3 - 4 = ? 3/3/2017 19
• 21. • Examples: • 7 + 5 = 12 • -7 -5 = -12 • -7 + 5 = -2 • 7 – 5 = 2 3/3/2017 21
• 22. Multiplying Integers • + . + = + • - . - = + • + . - = - • - . + = - Examples: 7 x 5 = 35 (-7)(-5) = 35 (-7)(5) = -35 (7)(– 5) =- 35 3/3/2017 22
• 24. Rational Numbers • A Rational number is a number that can be written as a ratio a/b, for any two integers a and b. • The notation is also called a fraction. • For example, 3/4, 5/7, 9/4 etc. are all fractions. • 1/2= 0.5 • 3/4 = 0. 75 • 5/7 = 0.714285714285…. • 9/4 = 2.25 • 1/3 = 0.333333333… 3/3/2017 24
• 25. Rational Number • Note-1: The numerator (the number on top) and the denominator (the number at the bottom) must be integers. • Note-2: Every integer is a rational number simply because it can be written as a fraction. For example, 6 is a rational number because it can be written as 6 1 . 3/3/2017 25
• 26. Rational Number Rational numbers are numbers which are either repeated, or terminated. Like, 0.25 0.7645 0.232323..... 0.333333…. 0.714285714285…. are all rational numbers. 3/3/2017 26
• 27. Rational Number • Examples of Rational Numbers 1) The number 0.75 is a rational number because it is written as fraction 3 4 . 2) The integer 8 is a rational number because it can be written as 8 1 . 3) The number 0.3333333... = 1 3 , so 0.333333.... is a rational number. This number is repeated but not terminated. 3/3/2017 27
• 28. Irrational Numbers Irrational Numbers are decimals which are Never ending and Never Repeating. • 3/3/2017 28 ‘
• 29. Irrational Number • An Irrational Number is basically a non-rational number; it consists of numbers that are not whole numbers. Irrational numbers can be written as decimals, but not as fractions. • Irrational Numbers are non-repeating and non-ending. • For example, the mathematical constant Pi = π = 3.14159… has a decimal representation which consists of an infinite number of non-repeating digits. 3/3/2017 29 ‘
• 30. Irrational Number • The value of pi to 100 significant figures is 3.141592653589793238462643383279502884197169399375 10582097494459230781640628620899862803482534211706 7... • Note: Rational and Irrational numbers both exist on the number line. 3/3/2017 30 ‘
• 31. Irrational Number Examples of Irrational Numbers 3/3/2017 31
• 33. Activity • Tell whether the following are rational or irrational numbers: 1. 1 2 = 2. 3 4 = 3. 0.2345234… = 4. 3= 5. 2= 6. 0. 315315315..... = 3/3/2017 33
• 34. Rational and Irrational Numbers • Rational Numbers: Either repeat, or terminate or both. • Irrational Numbers: Neither repeat, nor terminate. 3/3/2017 34
• 36. Real Number System • Real Number System: The collection of all rational and irrational numbers form the set of real numbers, usually denoted by R. • The real number system has many subsets: 1. Natural Numbers 2. Whole Numbers 3. Integers 3/3/2017 36
• 37. • Natural numbers are the set of counting numbers. {1, 2, 3,4,5,6,…} • Whole numbers are the set of numbers that include 0 plus the set of natural numbers. {0, 1, 2, 3, 4, 5,…} • Integers are the set of whole numbers and their opposites. {…,-3, -2, -1, 0, 1, 2, 3,…} Real Number System 3/3/2017 37
• 39. Complex Numbers • The largest existing numbers, comprising of Real and Imaginary numbers (a+i b, where , a, b are real). 3/3/2017 39
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