Metroc
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Than all people will have to use metric measurement. Schools will have to provide special courses for teaching metrics, metric tools for measuring will have to be bought, and everything will have to be relabeled. * * * * * But if all people use the metric system then you will have standard measurements! The question is about what will happen if you don't.
First of all, the metric unit IS the standard unit. It is the international standard, and only a few countries don't use it yet. It is not any more accurate - the inch, for example, is defined on the basis of the meter, so it is just as accurate. However, the metric system can help avoid confusions - for example, different countries used to have, and in part still have, different definitions for the pound. The main advantage of the metric system lies in its standardization - people all over the world using the SAME measurements.
I believe that si math involves calculations with US standard measurements. For example, in America we use feet, yards, miles, pounds, ounces etc.... The alternative is metric... meters, kilograms, liters.
base on what you measure to use the metric units.
If you need to memorize certain relationships between metric and American measurements, one of the most commonly needed is 1 inch equals 2.54 cm. A foot equals 12 inches. So multiply 35 feet by 12 inches. Then multiply the result by 2.54 centimeters per inch. This type of process keeps us from having to memorize hundreds of detailed unit multipliers, or looking them up in a book every time.