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What is the arithmetic to convert 4 mg in 2.5 mL into units on a U-100 scale?

Asked 11 May 2025Modified 15 months agoViewed 6.9k times
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The specifics, since they change the answer: 4 mg · 2.5 mL.

I would rather understand the derivation than memorise the outcome.

Two people I asked gave two answers that differ by a factor of ten, which is suggestive.

What is the general form of this calculation?

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