4 Binary Arithmetic - a dead simple explanation

numbers, human style:

numbers, robot style (and for all things digital):

We (people, that is) count and do all our arithmetic using just 10 digits: 0,1,2,3,4,5,6,7,8,9. This is called decimal arithmetic.

Computers and digital devices use the simplest form of arithmetic possible - just 2 digits: 0,1. This is known as binary arithmetic.

Any number can be written using the two digits 0 and 1.

For example:
decimal numbers 1, 2, 3 are the same as binary numbers 01, 10, 11.
23 is 10111
123 is 1111011
And so it goes.

That's it!