# Number Conversions Dr. Sarita Agarwal (Acharya Narendra Dev College,University of Delhi)

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1 Conversions Dr. Sarita Agarwal (Acharya Narendra Dev College,University of Delhi) INTRODUCTION System- A number system defines a set of values to represent quantity. We talk about the number of people attending a class, the number of modules taken by each student and use numbers to represent grade. System can be categorized in two systems:- (a) Non-Positional System (b) Positional System Non-Positional System- In ancient times, people used to count on fingers, when the fingers became insufficient for counting, stones, pebbles or sticks were used to indicate values. But it was very difficult to perform arithmetic with such a number system as there is no symbol for zero. Positional System- In this system the value of each digit is defined not by the symbol but also by the symbol position. Positional System is used to perform arithmetic. Existing Positional number system is decimal number system. Apart from the decimal number system, there are binary number system, octal number system and hexadecimal number system. Base (Radix)- In the number system the base or radix tells the number of symbols used in the system. In the earlier days, different civilisations were using different radixes. The Egyptian used the radix 2, the Babylonians used the radix 60 and Mayans used 18 and 20. The base of a number system is indicated by a subscript (decimal number) and this will be followed by the value of the number. For example (952) 10, (456) 8, (314) 16 System that are used by the computers- Decimal System System System System Decimal System- The decimal system is the system which we use in everyday counting. The number system includes the ten digits from 0 through 9. These digits are recognized as the symbols of the decimal system. Each digit in a base ten number represents units ten times the units of the digit to its right. For example- 9542= = ( ) + ( ) + (4 10) + ( ) 1

2 System - Computers do not use the decimal system for counting and arithmetic. Their CPU and memory are made up of millions of tiny switches that can be either in ON and OFF states. 0 represents OFF and 1 represents ON. In this way we use binary system. system has two numbers 0 and 1. system has base 2 therefore the weight of n th of the number from Right Hand Side is n th 2 n-1. System- The octal system is commonly used with computers. The octal number system with its 8 digit 0,1,2,3,4,5,6, and 7 has base 8. The octal system uses a power of 8 to determine the digit of a number s position. System- is another number system that works exactly like the decimal, binary and octal number systems, except that the base is 16. Each hexadecimal represents a power of 16. The system uses 0 to 9 numbers and A to F characters to represent 10 to 15 respectively. Conversions- Any number in one number system can be converted into any other number system. There are the various methods that are used in converting numbers from one base to another. Conversions of Decimal to - The method that is used for converting of decimals into binary is known as the remainder method. We use the following steps in getting the binary number- (a) Divide the decimal number by 2. (b) Write the remainder (which is either 0 or 1) at the right most position. (c) Repeat the process of dividing by 2 until the quotient is 0 and keep writing the remainder after each step of division. (d) Write the remainders in reverse order. Example- Convert (45) 10 into binary number system Remainder Thus (45) 10 = (101101) 2 2

3 Note- In every number system- (a) The first from the right is referred as LSB (Least Significant Bit) (b) The first from the left is referred as MSB (Most Significant Bit) Conversions of Decimal Fractions to Fractions- For converting decimal fractions into binary fractions, we use multiplication. Instead of looking for a remainder we look for an integer. The following steps are used in getting the binary fractions- (a) Multiply the decimal fraction by 2. (b) If a non-zero integer is generated, record the non-zero integer otherwise record 0. (c) Remove the non-zero integer and repeat the above steps till the fraction value becomes 0. (d) Write down the number according to the occurrence. Example- Find the binary equivalent of (0.75) 10. (to be recorded) = = Thus (0.75) 10 = (0.11) 2. Moreover, we can write (45.75) 10 = ( ) 2. Remark- If the conversion is not ended and still continuing; we write the approximation in 16 s. Example- Find the binary equivalent of (0.9) 10. (to be recorded) = = = = = = = = = = = = = = = = = = Thus (0.9) 10 = ( ) 2. 3

4 Conversion of Decimal to - In converting decimal to octal, we follow the same process of converting decimal to binary. Instead of dividing the number by 2, we divide the number by 8. Example- Convert (45) 10 into octal number system Remainder Thus (45) 10 = (55) 8. Conversions of Decimal Fractions to Fractions We follow the same steps of conversions of decimal fractions to binary fractions. Here we multiply the fraction by 8 instead of 2. Example- Find the octal equivalent of (0.75) 10. (to be recorded) = Thus (0.75) 10 = (0.6) 8. And (45.75) 10 = (55.6) 8. Conversion of Decimal to We divide by 16 instead of 2 or 8. If the remainder is in between 10 to 16, then the number is represented by A to F respectively. Example- Convert (45) 10 into hexadecimal Remainder 16 2 D Thus (45) 10 = (2D) 16. Conversions of Decimal Fractions to Fractions Here we multiply the fraction by 16 instead of 2 or 8. If the non-zero integer is in between 10 to 16, then the number is represented by A to F respectively. 4

5 Example- Find the hexadecimal equivalent of (0.75) 10. (to be recorded) = C (12 = C) Thus (0.75) 10 = (0.C) 16. And (45.75) 10 = (2D.C) 16. Conversions of to Decimal In converting binary to decimal, we use the following steps- (a) Write the weight of each. (b) Get the weighted value by multiplying the weighted position with the respective. (c) Add all the weighted value to get the decimal number. Example- Convert (101101) 2 into decimal number system Thus (101101) 2 = = = 45 Conversions of Fractions to Decimal Fractions The conversions of binary fractions to the decimal fractions is similar to conversion of binary numbers to decimal numbers. Here, instead of a decimal point we have a binary point. The exponential expressions (or weight of the s) of each fractional placeholder is 2-1, 2-2 Example- Convert ( ) 2 into decimal number system Thus ( ) 2 = =

6 Conversions of to - We use the following steps in converting binary to octal- (a) Break the number into 3- sections starting from LSB to MSB. (b) If we do not have sufficient s in grouping of 3-s, we add zeros to the left of MSB so that all the groups have proper 3- number. (c) Write the 3- binary number to its octal equivalent. Example- Convert (101101) 2 into octal Thus (101101) 2 = (55) 8. Example- Convert ( ) 2 into octal Thus ( ) 2 = (155) 8. Conversions of Fractions to Fractions- We use the following steps in converting binary fractions to octal fractions- (d) Break the fraction into 3- sections starting from MSB to LSB. (e) In order to get a complete grouping of 3 s, we add trailing zeros in LSB. (f) Write the 3- binary number to its octal equivalent. Example- Convert ( ) 2 into octal Thus (101101) 2 = (55.6) 8. Conversions of to - We convert binary to hexadecimal in the similar manner as we have converted binary to octal. The only difference is that here, we form the group of 4 s. 6

7 Example- Convert (101101) 2 into hexadecimal. Decimal D Thus (101101) 2 = (2D) 16. Conversions of Fractions to Fractions - We convert binary fractions to hexadecimal fractions in the similar manner as we have converted binary fractions to octal fractions. The only difference is that here we form the group of 4 s. Example- Convert ( ) 2 into hexadecimal. Decimal D C Thus ( ) 2 = (2D.C) 16. Conversions of to Decimal- We follow the same steps of conversion of binary to decimal. The only difference is that here weight of n th is 8 n-1 instead of 2 n-1. Example- Convert (55) 8 into decimal number system Thus (55) 8 = = 45 Conversions of Fractions to Decimal Fractions- The weight of the of the fraction placeholder is 8-1, 8-2. We follow the same steps of conversion of binary fractions to decimal fractions. 7

8 Example- Convert (55.6) 8 into decimal number system Thus (55.6) 8 = = Conversions of to - We use the following steps in converting octal to binary- (a) Convert each octal digit into 3- binary equivalent. (b) Combine the 3- section by removing the spaces to get the binary number. Example- Convert (55) 8 into binary Thus (55) 8 = (101101) 2. Example- Convert (456) 8 into binary Thus (456) 8 = ( ) 2. Conversions of Fractions to Fractions- We follow the same steps of conversion of octal to binary. Example- Convert (55.6) 8 into binary Thus (55.6) 8 = ( ) 2. 8

9 Conversions of to - The conversion involves the following steps- (a) Convert each octal digit to 3 binary form. (b) Combine all the 3- binary numbers. (c) Group them in 4- binary form by starting from MSB to LSB. (d) Convert these 4- blocks into their hexadecimal symbols. Example- Convert (55) 8 into hexadecimal Combining the 3- binary block, we have Grouping them in 4 binary form- Symbol D Thus (55) 8 = (2D) 16. Conversions of Fractions to Fractions- The method of conversion is based on the same procedure that we have discussed in conversions of octal to hexadecimal. Example- Convert (55.6) 8 into hexadecimal Combining the 3- binary block, we have Grouping them in 4 binary form- Symbol D C Thus (55) 8 = (2D.C) 16. Conversions of to Decimal- We do the conversion of hexadecimal to decimal as we have done the conversion of binary to decimal. Here weight of n th is 16 n-1 instead of 2 n-1. 9

10 Example- Convert (2D) 16 into decimal. 2 D(=13) Thus (2D) 16 = = 45. Conversions of Fractions to Decimal Fractions- We do the conversion of hexadecimal fractions to decimal fractions in the similar manner as we have done the conversion of binary fractions to decimal fractions. Here weight of is 16-1, Example- Convert (2D.C) 16 into decimal. 2 D(=13) C(=12) Thus (2D.C) 16 = = Conversions of to -We use the following steps- (a) Convert each hexadecimal digit to its 4- binary equivalent. (b) Combine all the binary numbers. Example- Convert (2D) 16 into binary. 2 D(=13) Thus (2D) 16 = ( ) 2 = (101101) 2. Conversions of Fractions to Fractions -We use the same steps of hexadecimal to binary conversion. 10

11 Example- Convert (2D.C) 16 into binary. 2 D(=13) C(=12) Thus (2D) 16 = ( ) 2 = ( ) 2. Conversions of to - We convert each hexadecimal digit in binary. Combine all the binary numbers. Again group them into 3- form. Convert the 3- block in octal. Example- Convert (2D) 16 into octal. 2 D(=13) Combining the binary number, we get = Grouping the binary number in Thus (2D) 16 = (55) 8. Conversions of Fractions to Fractions We follow the same steps of hexadecimal to octal conversion. Example- Convert (2D.C) 16 into octal. 2 D(=13) C(=12) Combining the binary number, we get = Grouping the binary number in Thus (2D.C) 16 = (55.6) 8. 11

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