Lesson 2 – Number Systems Unit 18 – Computational Thinking

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

Earliest recorded ‘counting system’ Scratch marks on a bone http://www.vedicsciences.net/articles/history-of-numbers.html

Egyptians Needed numerical system for accurate measurement of elaborate buildings

Use the Egyptian Counting System

What do these numbers represent?

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

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

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

Your Task

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