Cracking the Code: Binary Basics
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Cracking the Code: Binary Basics
Understanding How Computers Communicate Year 5 Digital Technologies NSW Curriculum ST3-DDT-02
What is Binary Code?
Binary uses only two digits: 0 and 1 Like an ON/OFF switch for computers 0 = OFF (no electricity) 1 = ON (electricity flowing) All computer information uses this system
Decimal vs Binary Number Systems
{"left":"Decimal (Base-10): Uses 10 digits (0-9)\nWe use this every day for counting\nExample: 25 means 2 tens + 5 ones","right":"Binary (Base-2): Uses only 2 digits (0,1)\nComputers use this for all calculations\nExample: 11001 in binary = 25 in decimal"}
Binary Place Values Game
Each position has a value: 128, 64, 32, 16, 8, 4, 2, 1 Start from the right and work left Add up the values where there's a 1 Example: 00000101 = 4 + 1 = 5
Converting Numbers to Binary
Let's convert the number 13 to binary 13 = 8 + 4 + 1 8 = position 4, 4 = position 3, 1 = position 1 Binary: 00001101 Practice with your partner!
Secret Messages with ASCII
Each letter has a special binary code A = 01000001, B = 01000010, C = 01000011 Let's spell CAT in binary: C = 01000011, A = 01000001, T = 01010100 Try spelling your name!
Why Do Computers Use Binary?
Think about what you've learned... How might ON/OFF switches help computers work? What would happen if computers tried to use 10 digits like us? Share your ideas with the class!
You've Cracked the Code!
Binary is the language of all computers Every photo, video, and game uses 1s and 0s You can now convert numbers and letters to binary Next: Practice with your binary homework challenge! Remember: 0 = OFF, 1 = ON