10:57 Number Systems Introduction - Decimal, Binary, Octal & Hexadecimal
Thorough introduction to decimal, binary, octal and hexadecimal number systems.
Non-base 10 number systems
Have an appreciation of non-base 10 number systems
5 hand-picked video lessons for this topic, each checked for relevance and clarity, graded by difficulty and labelled by depth. Press play to watch — nothing loads from YouTube until you do.
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5 shown 10:57 
4:45 All of Base Number Systems Explained in 5 Minutes
A brisk, clear tour of how any number base works, from binary upward.
9:12 Base 12 - Numberphile
Numberphile's engaging argument for the dozenal (base 12) system.
10:09 72. AQA GCSE (8525) SLR13 - 3.3 Number bases
UK teacher walks through decimal, binary and hexadecimal number bases with clear structure.
5:08 A brief history of numerical systems - Alessandra King
Beautifully animated history of numeral systems, including bases beyond ten.