Learn Finnish: Maksaako hattu kaksikymmentäkolme euroa? - Does the hat cost twenty-three euros?

In Finnish, you make a yes/no question by adding the ending -ko (or -kö) to the word you are asking about, and then moving that word to the front of the sentence. Here, maksaa (costs) becomes Maksaako to ask "Does it cost?".

Wait, doesn't maksaa mean "to pay"?

Yes, maksaa can mean both "to pay" and "to cost"! You can tell which one it is from the context. Since a hat can't buy things, hattu maksaa means the hat costs money, rather than the hat paying for something.

Why is "twenty-three" written as one long word (kaksikymmentäkolme)?

In Finnish, numbers below one hundred are always written together as a single word. It breaks down literally into kaksi (two) + kymmentä (tens) + kolme (three).

Why is it euroa instead of just euro?

Because it comes after a number greater than one. In Finnish, any noun following a number (other than one) must be in the partitive form. So you say yksi euro (one euro), but kaksikymmentäkolme euroa (23 euros).