Discussion
Decimal part of common logarithm of a number is called
Answer: D
The fractional part of a common logarithm is the mantissa; the whole-number part is the characteristic.
\[ \log 342 = 2.5340 \quad\Longrightarrow\quad \text{characteristic } 2, \ \text{mantissa } 0.5340 \]
The mantissa depends only on the sequence of digits, which is why log tables need list it just once for each digit string.
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