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Millions Billions Trillions
Great Powers Little Powers 15 The Delusive Average
How we got Logarithms 22 Approximations
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1ox 1ox admirable unit angle approximation arithmetic average base billion miles bottles calculations coins comparison convenient cosines count the number cube cubic centimetre cubic f00t cubic miles decimal system density diameter distance divide division dozen duodecimal earth equal equation error exactly example feet figure accuracy fraction give half-crowns Hence hypotenuse length less light light-years logarithms Lord Dunsany magnified mass means measured metre metric system miles per hour million molecules multiply the number nearest star Neptune noughts number of days parallax parsec planets possible pound weight pounds powers problem proportion radians radius recurring decimal remainder result round the world scale shillings side similar lines similar triangles sines small dice solar system solution speed sphere square miles square r00t subtract Suppose tangent tenth tons trillion unit Uranus volume want to find weight whole number write yards