Questions & Answers about Osoitteessa on kaksi numeroa.
Why does the word osoite (address) become osoitteessa with a double "e"?
Osoite is a Finnish word that ends in -e. When you add an ending to this type of word (like the "in" ending -ssa), the final -e always doubles. This gives us the stem osoittee- before adding the ending.
Why doesn't the sentence start with a Finnish word for "there"?
Why is the verb on (is) used here instead of ovat (are) for "two numbers"?
In sentences that state what exists in a location, the verb is always the singular on. It doesn't change to the plural ovat, even if there are multiple things at that location!