Bits and Bytes:

http://computer.howstuffworks.com/bytes.htm/printable

You will find there is a lot of information on the site. To help you identify what you need to know, search the site for the keywords  and questions listed below

Digit: Any of the numerals from 0 to 9, esp. when forming part of a number

Base 10: Well known decimal number system, represent any value with digit 0-9.

Where does the word bit originate from?

Comes from the word Binary digIT

Examine the tables beow:

Base10:

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

How would you write 4,321(4 * 1000) + (3 * 100) + ( 2 * 10) + (1 * 1) = 4000 + 300 + 20 + 1

Examine the table below:

Base2

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)

Write the following numbers in binary (base 2)

 21

10101= (1 x 16) + (1 x 4) + (1 x 1)

24
11100= (1 x 16) + (1 x8)

30
11110= (1 x 16) + (1 x 8) + (1 x 4) + (1 x 2)

What is a byte?

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

How many bytes in a kilo, mega, giga and tera bytes?

1 kilobyte = 1024 bytes

1 megabyte = 1 048 576 bytes

1 gigabyte = 1 073 741 824 bytes

1 terabyte = 1 099 511 627 776 bytes