The metric system.
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The decimal system is based on 10 and the powers of 10. The main disadvantage is that 10 is divisible by only 2 and 5. So commonly needed fractions, such as a third end up being infinite decimals.
The SI
SI uses powers of 10.
To convert millimeters (mm) to centimeters (cm), you need to divide by 10 since there are 10 millimeters in a centimeter. Therefore, 30mm is equal to 3cm. This conversion is based on the metric system where units are related by powers of 10.
* In those countries that use the long scale (based on powers of a million) like Europe: a decillion = (10^6)^10 = 10^60 * In those countries that use the short scale (based on powers of a thousand plus one) like USA: a decillion = (10^3)^(10+1) = 10^33 A googol is 10^100 In either case the googol is larger.