Hexadecimal & Colour

Base 16 and screen pixels

An interactive lesson with 6 steps, about 5 minutes: you predict, drag and solve, with instant feedback on every answer. It runs in your browser and needs JavaScript.

What you’ll learn

• Hexadecimal uses 0–9 and A–F. One hex digit is exactly 4 bits.
• Screen colours mix red, green and blue light, one byte each (#RRGGBB).
• 24-bit colour gives $2^{24} \approx 16.7$ million colours.

Steps

1. Base 16
2. Read hex
3. Mixing light
4. Hex to decimal
5. Orange
6. How many colours?