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I assume you mean BCD, Binary Coded Decimal.

BCD uses 4 bits to represent one decimal number.

The easiest way is to make a table, with decimal, BCD, Hex and straight binary.

1 0000 0001 1 0000 0001

2 0000 0010 2 0000 0010

3 0000 0011 3 0000 0011

...Skip a bit....

9 0000 1001 9 0000 1001

10 0001 0000 A 0000 1010

11 0001 0001 B 0000 1011

...Skipping again....

15 0001 0101 F 0000 1111

16 0001 0110 10 0001 0000

Get the idea? In the first one, 4 binary bits are matched with one decimal digit. In straight binary, the number scrolls on.

Interestingly, this caused some problems, earning itself the name 'the 2.1K bug'. some systems, generally small systems like Eftpos terminals, wrote values in BCD binary, but read them as straight binary. So dates were written in BCD 10, but read back as (check the table) Ordinary binary 16. Hilarity ensued.

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