Learn Danish: Vi køber ikke fyrre tomater. - We do not buy forty tomatoes.

Yes! While the spelling changes slightly, fyrre (40) is based on the word for four. In Danish, the numbers 20, 30, and 40 are straightforwardly built on 2, 3, and 4. You will notice a big shift when you reach 50, where Danish starts using a unique historical counting system based on twenties!

Why does the sentence say køber ikke instead of ikke køber?

In Danish main clauses, the verb is almost always the second piece of information. Since Vi (We) is the first part, the verb køber (buy) must come second. The negation ikke (not) simply follows it, making the literal word order "We buy not forty tomatoes."

Could this sentence also translate to "We are not buying forty tomatoes"?

Exactly. Danish does not have a separate "-ing" form to show that an action is happening right now. The present tense køber covers both "buy" and "are buying".

How do you form the plural for tomato in Danish?

The singular word is en tomat. Like many regular Danish nouns, it forms its plural simply by adding -er to the end, giving us tomater.