← What a Byte Holds · Lesson 1 of 3
Binary on one hand
In binary each place is worth double the one before: 1, 2, 4, 8, 16. With five switches (or five fingers, up or down) you can show every number from 0 to 31.
A byte is eight such places, worth 1 up to 128, so one byte holds any number from 0 to 255: two hundred and fifty-six different values.
Which places are switched on to make 21 in binary?
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