Bits & Bytes

1. What is a Digit

 A digit refers to any of the numerals from 0 to 9, esp. when forming part of a number.

 2. “normal” counting numbers used in everyday life a based on what sequence of numbers?

3. Where does the word bit originate from?
 The word BIT was first used in a 1948 Paper. Theword bit is a portmanteau word for binary digit or a possibly binary digit.

4. Binary numbers don’t use base 10. What base do they use? What digits are available in base 2?
It operates in BASE 2, the numbers that make up the base 2 system are 0 and 1.

5. Examine the tables below

Base 10

Place Value	10 000	1 000	100	10	1
Place Value	104	103	102	101	100
Digit	9	0	3	0	2
Digit Value	90 000	0	300	0	2

90 302 (base 10) = (9 x 10000) + (3 x 100) + (2 x 1)

If  6,357 can be written as;

(6 * 1000) + (3 * 100) + (5 * 10) + (7 * 1) = 6000 + 300 + 50 + 7

Ø  How would you write 4,321

( 4 * 1000) + ( 3* 100) + ( 2*10 ) = ( 1 *1) = 4000 + 300 + 20 + 1

6. Examine the table below

Base 2

Place Value	16	8	4	2	1
Place Value	24	23	22	21	20
Digit	1	0	1	0	0
Digit Value	16	0	4	0	0

10100 (base 2) = (1 x 16) + (1 x 4) = 20 (base 10)

Ø  Write the following numbers in binary (base 2)

21

24

30

7. What is a byte?

A group of binary digits or bits (usually eight) operated on as a unit.

7. How many bytes in a kilo, mega, giga and tera bytes.

1 kilobyte = 1024 bytes

7. Complete the following conversions;

1000 Mb =   ?Gb

500 Gb = ?Mb

5000 Kb = ? Mb