Logarithms II — O/L Mathematics

Before calculators sat in every schoolbag, engineers building bridges, astronomers charting stars, and accountants closing the year's books all multiplied and divided enormous numbers using nothing but a printed table of logarithms. The trick they used — turning a hard multiplication into an easy addition — is exactly what you learn here. You will meet it again in O/L science, and understanding it is understanding why the log button on your calculator does what it does.