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Binary

When we learn arithmetic, we use Base 10 numbers. (denary or decimal system).

The number 1583 means 1 'thousand', 5 'hundreds', 8 'tens' and 3 'units'...

1000 100 10 1
1 5 8 3

The Binary number system is a Base 2 system.

Consider the binary number 10010110.

We can set it out under headings....

128 64 32 16 8 4 2 1
1 0 0 1 0 1 1 0

So the binary number 10010110 represents the denary number 128 + 16 + 4 + 2 = 150.