Chapter 2 Binary Values and Number Systems

in base 10 positional notation is: 6 x 10 2 = 6 x 100 = x 10 1 = 4 x 10 = x 10º = 2 x 1 = 2 = 642 in base 10 This number is in base 10 The power indicates the position of the number Positional Notation

3 7 d n * R n-1 + d n-1 * R n d 2 * R + d 1 As a formula: 642 is 6 3 * * R is the base of the number n is the number of digits in the number d is the digit in the i th position in the number Positional Notation

4 68 What if 642 has the base of 13? 642 in base 13 is equivalent to 1068 in base x 13 2 = 6 x 169 = x 13 1 = 4 x 13 = x 13º = 2 x 1 = 2 = 1068 in base 10 Positional Notation

5 9 Decimal is base 10 and has 10 digits: 0,1,2,3,4,5,6,7,8,9 Binary is base 2 and has 2 digits: 0,1 For a number to exist in a given base, it can only contain the digits in that base, which range from 0 up to (but not including) the base. What bases can these numbers be in? 122, 198, 178, G1A4 Binary

6 10 How are digits in bases higher than 10 represented? With distinct symbols for 10 and above. Base 16 has 16 digits: 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E, and F Bases Higher than 10

7 What is the decimal equivalent of the octal number 642? 6 x 8 2 = 6 x 64 = x 8 1 = 4 x 8 = x 8º = 2 x 1 = 2 = 418 in base Converting Octal to Decimal

8 What is the decimal equivalent of the hexadecimal number DEF? D x 16 2 = 13 x 256 = E x 16 1 = 14 x 16 = F x 16º = 15 x 1 = 15 = 3567 in base 10 Remember, the digits in base 16 are 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F Converting Hexadecimal to Decimal

9 What is the decimal equivalent of the binary number ? 1 x 2 6 = 1 x 64 = x 2 5 = 1 x 32 = x 2 4 = 0 x 16 = x 2 3 = 1 x 8 = x 2 2 = 1 x 4 = x 2 1 = 1 x 2 = x 2º = 0 x 1 = 0 = 110 in base Converting Binary to Decimal

10 Remember that there are only 2 digits in binary, 0 and is 0 with a carry Carry Values Arithmetic in Binary

11 Remember borrowing? Apply that concept here: Subtracting Binary Numbers

12 Counting in Binary/Octal/Decimal

13 Mark groups of three (from right) Convert each group is 253 in base 8 17 Converting Binary to Octal

14 Mark groups of four (from right) Convert each group A B is AB in base Converting Binary to Hexadecimal

15 While (the quotient is not zero) Divide the decimal number by the new base Make the remainder the next digit to the left in the answer Replace the original decimal number with the quotient Algorithm for converting number in base 10 to other bases 19 Converting Decimal to Other Bases

16 Converting Decimal to Octal What is 1988 (base 10) in base 8? Answer is :

17 What is 3567 (base 10) in base 16? 20 Converting Decimal to Hexadecimal D E F

What are your thoughts? 18 Many argue that encoding information often dilutes or otherwise distorts the information, since it essentially forces the information to be quantified. They argue that a questionnaire in which subjects are required to record their opinions by responding within a scale from one to five is inherently flawed. To what extent is information quantifiable? Is the debate over nuclear power and nuclear waste quantifiable? Is it dangerous to base decisions on averages and other statistical analysis? Is it ethical for news agencies to report polling results without including the exact wording of the questions?

Problem Solving 19 A palindrome is a word or number that reads the same backward as it does forward. Numbers such as 606 and 4334 are palindromes. While driving his car, Bob observes that the odometer reading forms a palindrome. It displays the mileage 13, 931. Bob keeps driving. Two hours later, he looks at the odometer again and, to his surprise, it displays a different palindrome! What is the most likely speed that Bob is traveling?