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Let's look at it again.

You had a 1M stock solution, but you wanted to dilute it down to a 1mM working solution.

You knew that 1 mL of the stock solution would be enough to make 1000 mL of the working solution.

That's a 1:1000 dilution.

So you could have done the 1:1000 dilution in one step:

But your boss wouldn't have liked that. So instead you did three 1:10 dilutions in a row.