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Sundlaugin er tuttugu og fimm metrar.

Sundlaugin er tuttugu og fimm metrar.
The swimming pool is twenty-five meters.
From Lesson 72:Compound numbers from 21 (tuttugu og)·Icelandic

Questions & Answers about Sundlaugin er tuttugu og fimm metrar.

Why is there an og between tuttugu and fimm?
In Icelandic, when you build compound numbers in the twenties and beyond, you must connect the tens and the ones with og (and). So, "twenty-five" is literally said as tuttugu og fimm.
Does the number tuttugu change its form to match the noun it counts?
No, tuttugu (twenty) never changes its spelling. While the numbers 1 through 4 change depending on the gender and case of the noun they describe, higher numbers like tuttugu and fimm (five) stay exactly the same.
How do we get the ending on sundlaugin?
The base word is sundlaug (swimming pool), which is a feminine noun. The -in at the end is the attached definite article ("the"), turning "a swimming pool" into "the swimming pool".
What is the singular form of metrar?
The singular word for meter is metri. It is a masculine noun, and when we are counting more than one, we drop the -i and add the regular plural ending -ar to make metrar.

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