BCD stands for Binary Coded Decimal: take the decimals and encode them in 4 bits each (thus wasting 6 of the 16 values). This had the advantage of being simpler to display (no divisions, just take a block of four bits and it's your decimal), and also for float numbers that can be accurately represented with a decimal radix (as 0.01), then it can also (set aprat the overflow issue) be accurately represented in BCD format.
Floating point problem
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