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Many non-integral values, such as decimal 0.2, have an infinite place-value representation in binary (.001100110011...) but have a finite place-value in binary-coded decimal (0.0010)[bcd]. Consequently a system based on binary-coded decimal representations of decimal fractions avoids errors representing and calculating such values.

Rounding at a decimal digit boundary is simpler in BCD. Addition and subtraction in decimal does not require rounding.

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