1. Lesson 2 – Number Systems
Unit 18 – Computational Thinking

2. Where do numbers come from?
Were numbers invented?....
If so by whom, when and why ?

3. Earliest recorded ‘counting system’
Scratch marks on a bone

4. Egyptians
Needed numerical system for accurate measurement of elaborate buildings

5. Use the Egyptian Counting System

6. What do these numbers represent?

7. Decimal System Introduces zero Origins are:
Mayan
Babylonian
Indian
Uses the principle of a place value:
Hundreds (100’s)
Tens (10’s)
Units (0)

8. Decimal System Based on 10 symbols 0 – 9
Click over to a new place value after 9

9. Other Systems that we will use
Binary
Base 2
Uses 1 & 0
Hexadecimal
Base 16
Uses additional symbols (A,B,C,D,E,F)

10. Binary Decimal Binary The basis of electrical data transmission
0 = no current flowing
1 = current flowing
Decimal
Binary

11. Your Task

12. Task Submission Upload your answers to Moodle
You can use any format – Word document, Excel
Enrolment code is btec
MUST be uploaded by next Wednesday
Any problems? the task to me instead
Use the naming convention as example for TurnItin submission