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We tend to think that base 10 (Decimal) is the only number system but this isn't true! The ancient babylonians used a base 60 number system (60 seconds in a minute, sound familiar?) and there is an ancient tribe in Mexico that still uses the base 8 (Octal) system.
Here is a fascinating list of the different number systems. Why not have a go at creating your own?
List of Number Systems
https://en.wikipedia.org/wiki/List_of_numeral_systems
Fascinating TED talk on Number Systems
Video: Understanding Binary, Hex, Decimal Number Systems
https://www.splashlearn.com/math-vocabulary/number-sense/number-system
https://en.wikipedia.org/wiki/Numeral_system
https://simple.wikipedia.org/wiki/Hexadecimal
https://www.includehelp.com/computer-number-systems.aspx
Additional PowerPoint Presentation
www.teachyourselfpython.com