Light switch. Almost any on/off switch you use is base 2.
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They are essentially precursors of the ten digits which we use today in everyday arithmetic.
A triangle twice as high as a parallelogram with the same base has the same area.
The number or expression that is used as a factor in a repeated multiplication base could also mean the type of number system being used.Binary is base 2 mathematics normal everyday mathematics such as 9+9=18 is base 10
In the everyday decimal (base-10) system that everybody is familiar with, there is no digit greater than 10. In the hexadecimal system, with a base of 16, 'ten' is represented by 'A', and the symbols 'B', 'C', 'D', 'E', and 'F' are used to represent the digits 'eleven' through 'fifteen'.
The Roman Numeral system is considered a base ten system.