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Yes because at 1*10^-4, that is when it is appropriate to approximate since the value is very small. I think in terms of regular K values, it is that anything smaller than 10^-3 is considered small enough.
The safest way (or a double check) to know whether to approximate or not is to see if the change is less than 5% of the original amount present. You can solve the problem by approximation first, then do a quick calculation to make sure that the change falls within 5%.
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