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.
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You can check the Wikipedia article on "SI units".
The Si are units that are based as number 10. This is a math problem.
In math, there are 9 zeros in giga. Giga is part of the SI prefixes. Giga symbol is G. If giga were money it would means you have one billion dollars.
The metric (SI) unit for weight is the newton, since weight is a force. When people talk about "weight", they sometimes actually mean "mass". The unit for mass is the kilogram.
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