how do you do metric unit conversions?  i had to do it for math a long time ago and i still dont under stand it

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Some basic formulas can help convert different units from metric to US and vice versa.

Inches - centimeters

For example, there are 2.54 centimeters in an inch. So to convert inches to centimeters, multiply by 2.54 (ie, 10 inches x 2.54 centimeters/inch = 25.4 centimeters). To convert centimeters to inches, divide by 2.54 instead of multiplying (ie, 10 centimeters/2.54 = 3.937 inches).

Miles - kilometers

For miles and kilometers, use the fact that one kilometer equals 0.62 miles (actually, 0.62137 miles). So multiply by 0.62 to go from kilometers to miles (ie, 10 kilometers x 0.62 miles/kilometer = 6.2 miles). To change from miles into kilometers, divide by 0.62 (ie, 10 miles/0.62 = 16.13...

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