Computer & Online Safety Basics / How computers work
Lesson 4 of 30
Binary numbers
Binary counts with only 0 and 1. Each place is worth double the one to its right: 1, 2, 4, 8, 16 and so on. So 1011 in binary is 8 + 2 + 1 = 11.
Key points
- Place values: 128 64 32 16 8 4 2 1
- Add the places that have a 1
- Practise in the Binary Blitz game
1011 = 8 + 0 + 2 + 1 = 11
11111111 = 255Quiz · +10 XP
What is the binary number 101 in decimal?
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