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...working adults to retired adults is disturbing. Predictions are, that by 2030 the ratio will be two working adults to every retired person, instead of three to one now, and four to one ten years ago. Often ratios are implicit in the language rather than explicitly referred to: one teacher for 30 pupils; 2.4 children per woman of child bearing age; one retired person per...

...work out an average or area, and how to read a graph. We'll also show you why you don't need to understand fractions, and warn you about the percent button on calculators. OK, here we go. In week one, you learn about some basic concepts for numbers, including the way scientists write very big or very small numbers. You'll also cover units of measurement, like kilogrammes,...