Lesson 2 – Number Systems

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 http://www.vedicsciences.net/articles/history-of-numbers.html

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:

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 • 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? Email the task to me instead • Use the naming convention as example for TurnItin submission