- Digit- A digit is a single place that can hold numerical values between 0 and 9.Digits are normally combined together in groups to create larger numbers.

- Base 10- decimal number system
- Where does the word bit originate from? -The word 'bit' was derived from the term
**b**inary dig**it**(0 and 1). - “normal” -counting numbers used in everyday life a based on what sequence of numbers? The binary number system
- Examine the tables below

**Base 10**

Place Value | 10 000 | 1 000 | 100 | 10 | 1 |

Place Value | 10 ^{4} | 10 ^{3} | 10 ^{2} | 10 ^{1} | 10 ^{0} |

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)

- Examine the table below

**Base 2**

Place Value | 16 | 8 | 4 | 2 | 1 |

Place Value | 2 ^{4} | 2 ^{3} | 2 ^{2} | 2 ^{1} | 2 ^{0} |

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

- 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.

Kilo: 1024 bytes

Mega: 1 048 576 bytes

Giga: 1 073 741 824 bytes

Tera: 1 099 511 627 776 bytes

- Complete the following conversions;

1000 Mb = 0.9765625Gb

500 Gb = 512000Mb

5000 Kb = 4.88281Mb

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