Questions & Answers about Jeden i jeden to dwa.
Why does this sentence use to for "is" instead of jest?
In Polish, when you state a definition or do math (saying "X equals Y"), it is very common to use to instead of jest. Think of to in this sentence as an equals sign!
Will I always use jeden and dwa for the numbers one and two?
When you are doing abstract math or just counting out loud, yes! But remember that if you are counting actual objects, these numbers change to match the noun's gender. For example, you would use feminine forms for "one woman" (jedna kobieta) or "two women" (dwie kobiety).
Could I use the word for "plus" instead of i here?
Absolutely. You can also say Jeden plus jeden to dwa. Using i (and) is just a more conversational way to express addition, exactly like saying "one and one is two" in English.