The document discusses the metric system and scientific notation. It provides details on: - The metric system is based on units of meters, liters, and grams with prefixes like kilo and centi to denote multiples or fractions of the base units. - Scientific notation expresses very large or small numbers as a number between 1 and 10 with an exponent of 10. This makes concise expressions like 2.898 x 108 for 289,800,000. - Conversions within the metric system move the decimal point left or right based on moving to a larger or smaller unit, following powers of 10.