I'm sure I'm not the only one who finds my Calculus 12 students come in very weak on the basics of logs & exponents from Math 12. I use the accompanying two worksheets to help review the key log & exponent concepts they'll need in Calculus. Evaluating logarithms by inspection and with a calculator, understanding what they are, using log laws, solving logarithmic equations, solving exponential equations. The second worksheet mimics the first one but entirely using the natural number an