not all scientific calculators are the same.
what is the calc's brand and model number?
Check with the calculator's manual or if you don't have it look on the manufacturer's website
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Divide the denominator into the numerator. Multiply the answer by 100.
No, you cannot use models to multiply fractions!!
When you divide by fractions, you invert and multiply.
It doesn't make much sense to calculate logarithms with pencil and paper - the calculations are too involved. Just multiply the two numbers, and calculate the logarithm on a scientific calculator. If you don't have one, use the Windows calculator (it has a mode for scientific calculator).
A calculator can convert numbers that appear as decimals into numbers that appear as fractions. Fractions are generally considered more easy to use then decimals.