Powers, Exponents and Logarithms
A power a^n is repeated multiplication; an exponent is the number that says how many times; a logarithm is the exponent written as the answer.
General Aptitude · topic
Ratios, percentages, powers and logarithms
Ratios, proportion and percentages as multipliers; successive change, profit, loss, discount and interest; averages, mixtures, work, speed and ages as applications; exponent and logarithm rules, digit counts, unit digits and honest estimation.
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Ratios and Percentages
A dimensionless ratio compares like quantities by division after converting their units; a percentage is a ratio whose second term is fixed at 100.
Ratios, percentages, powers and logarithms cheat sheets
One-page visual sheets for this topic, in the sheet library on the store. Previews are free; the full sheets come with the subject pack.