Skostørrelsen står på utleieskoene.

Because Norwegian usually writes compound nouns as one word.

• sko = shoe
• størrelse = size

Together they become skostørrelse = shoe size.

This is very common in Norwegian. Where English often uses two words, Norwegian often makes a compound:

• skobutikk = shoe shop
• barneskole = primary school
• bussjåfør = bus driver

So skostørrelsen is not unusual at all—it is the normal Norwegian way to write the shoe size.

The ending -en marks the noun as definite singular.

• en skostørrelse = a shoe size
• skostørrelsen = the shoe size

Norwegian often puts the at the end of the noun instead of using a separate word like English does.

So:

• størrelse = size
• størrelsen = the size
• skostørrelse = shoe size
• skostørrelsen = the shoe size

Because in Norwegian, definiteness is often shown by an ending on the noun.

English:

• the shoe size

Norwegian:

• skostørrelsen

That -en already means the, so no extra word is needed here.

Utleieskoene is also a compound plus a definite plural ending.

It breaks down like this:

• utleie = rental / renting out
• sko = shoes
• -ene = the (plural definite)

So:

• utleiesko = rental shoes
• utleieskoene = the rental shoes

This is another very typical Norwegian compound.

Because -ene is a common ending for definite plural nouns.

Compare:

• en sko = a shoe
• skoen = the shoe
• sko = shoes
• skoene = the shoes

So:

• utleiesko = rental shoes
• utleieskoene = the rental shoes

Because the sentence is talking about a specific size marking and specific shoes—the rental shoes in question.

In context, this often means something like:

• The shoe size is on the rental shoes.

Norwegian very naturally uses definite forms when the thing is understood from the situation.

If you changed them to indefinite, the meaning would shift:

• En skostørrelse står på utleiesko.
  This sounds odd and much less natural in normal usage.

Yes, literally stå means stand, but Norwegian often uses stå where English uses be written, say, or be printed.

So in this sentence:

• Skostørrelsen står på utleieskoene.

it does not mean the shoe size is physically standing. It means something like:

• The shoe size is written on the rental shoes
• The shoe size appears on the rental shoes

This use of stå is very common for text and information:

• Det står på døra. = It says so on the door.
• Hva står det i brevet? = What does it say in the letter?

Yes, that is a very natural way to understand it.

In this sentence, står is best understood as:

• is written
• is printed
• appears

That is much closer to the real meaning than a literal English stands.

På usually means on.

Here it means the size is physically marked on the shoes:

• on the surface
• on the label attached to them
• somewhere on the shoes themselves

So:

• står på utleieskoene = is written on the rental shoes

Sometimes, depending on what you mean.

• på skoene = on the shoes
• i skoene = in the shoes / inside the shoes

If the size is printed inside the shoes, a speaker might sometimes say i skoene. But the sentence you were given uses på, so the idea is that the size marking is considered to be on them.

So both prepositions can be possible in different real-life situations, but they do not mean exactly the same thing.

This is the normal Norwegian main-clause pattern:

• subject: Skostørrelsen
• verb: står
• prepositional phrase: på utleieskoene

So it follows the common basic order:

• Subject + Verb + Other information

That makes it a very straightforward sentence grammatically.

It is singular.

• skostørrelse = shoe size
• skostørrelsen = the shoe size

If you wanted plural, you would use:

• skostørrelser = shoe sizes
• skostørrelsene = the shoe sizes

In this sentence, singular makes sense because each pair of shoes normally has one size marking.

Because Norwegian often prefers a simpler structure where the information is expressed with a verb and a prepositional phrase.

Instead of building a complicated possessive phrase, Norwegian can just say:

• Skostørrelsen står på utleieskoene.

That is a very natural way to express:

• the shoe size is shown on the rental shoes

It is simpler and more idiomatic.

Usually it refers to the specific rental shoes relevant in the situation.

So in context, it most naturally means:

• the rental shoes we are talking about

However, Norwegian sometimes uses definite forms in ways that sound broader or more general than English would expect, especially when the context is clear. Still, in this sentence, most learners should understand it as referring to a known set of rental shoes.

In Norwegian, common nouns are not capitalized.

So:

• skostørrelsen
• utleieskoene

both stay lowercase unless they begin the sentence.

This is different from German, but the same as English.

Here are the indefinite forms:

• en skostørrelse = a shoe size
• utleiesko = rental shoes

And the definite forms in the sentence are:

• skostørrelsen = the shoe size
• utleieskoene = the rental shoes

So the sentence uses definite forms because it refers to specific, identifiable things.

Yes. It is very natural Norwegian.

Two especially common features are:

1. compound nouns: skostørrelse, utleiesko
2. stå used for written information: står på

So even if the sentence may feel slightly different from English, its structure is very normal in Norwegian.

Yes, depending on what exactly you want to emphasize.

Possible alternatives include:

• Skostørrelsen er skrevet på utleieskoene. = The shoe size is written on the rental shoes.
• Størrelsen står på utleieskoene. = The size is written on the rental shoes.
• Du finner skostørrelsen på utleieskoene. = You can find the shoe size on the rental shoes.

But the original sentence is short, clear, and idiomatic.