Questions & Answers about Kaksi kertaa kolme on kuusi.
Why is kertaa in the partitive case instead of the basic form kerta?
Whenever you use a number greater than one (like kaksi), the noun that immediately follows it must be in the partitive singular case. Since kerta means a time or occasion, it becomes kertaa.
Why are the numbers kolme and kuusi in their basic forms? Don't numbers trigger the partitive?
Numbers only trigger the partitive for the noun they are directly counting (like kaksi kertaa). In this equation, kolme and kuusi stand on their own as the math values. When stating basic math facts like this, Finnish uses the basic nominative form for the numbers themselves.
Why do we use the singular verb on instead of a plural verb for multiple things?
Mathematical equations are treated as a single abstract idea. The entire phrase kaksi kertaa kolme acts as a singular unit, so it takes the third-person singular verb on.
Is kertaa the standard way to express multiplication in everyday Finnish?
Yes, for spoken math and basic multiplication tables, kertaa is the standard word. In strict formal mathematics you might see the verb kertoa (to multiply), but this sentence is the most natural way to say it in daily life.
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