Place Value, Base 2 · Theory

Ch 2 · Counting in Binary — card 1 of 4.

The numbers you use every day are denary (base 10): each column is worth ten times the one to its right (1, 10, 100, 1000…). Binary works exactly the same way, but each column is worth twice the one to its right.

For an 8-bit number the column values are:

To read a binary number, add up the column values that have a 1. Above: 64 + 8 + 4 + 1 = 77.