Discussion
Useful tools for rapid and accurate Computation and avoiding an error of omitting/writing a zero is called
Answer: A
Logarithms turn multiplication into addition and division into subtraction:
\[ \log(ab) = \log a + \log b, \qquad \log\left(\frac{a}{b}\right) = \log a - \log b \]
Long products and quotients become short sums, and because the characteristic records the power of ten separately, a stray zero cannot be gained or lost. That was their whole purpose before calculators.
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