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I want to typeset something like this: 3.0 × 3.0 × 0.9 mm

How can I do that in LaTeX (using siunitx package)?

So far, I have this:

\num{3.0} × \num{3.0} × \SI{0.9}{\milli\metre}

But probably someone else knows a better solution.

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I'd use \SI{2x3x4}{\milli\metre} to avoid confusion – daleif Oct 28 '11 at 9:42
Shouldn't it be 3 x 3 x 0.9 mm^3, since the expression describes a volume, not a length? – Jake Oct 29 '11 at 3:27
@Jake, strictly speaking, you are right. But in this context I was only interested in the length dimensions of a box, and not its volume. – Denilson Sá Oct 29 '11 at 3:38
up vote 18 down vote accepted
\SI[product-units = single]{2 x 3 x 4}{\milli\metre}

enter image description here

From section 5.11 Numbers with units of the manual.

share|improve this answer
You can also move that to your preamble, by giving \sisetup{product-units = single}, so you don't have to give the option every time. – Karl Sep 29 '15 at 12:17
And don't forget you can write \SI[product-units=power]{2 x 3 x 4}{\milli\metre} if you are interested in the volume (I know you aren't). – bers Nov 5 '15 at 23:28

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