But if it is being written as a response to a question, the F in four would be capitalized. Not to mention similar answers have been accepted.
If it was in capital you could get a hint that it's "Four" and not "two". It's done pretty often when you skip.
I'm so confused I've written Four boys and two girls What's wrong with my sentence
It was a "type what you hear" question and there was no voice. That ended an all correct answers streak, the best I had done so far. On another "no voice" question in a previous lesson I had typed in "nichts" for the answer to what was heard, but it was marked wrong.
About what? It's a word-for-word translation. You just need to memorise the words.
If it's the Mädchen part, both the singular and plural are the same.
Ein Junge und eine Mädchen.
A boy and a girl.
Vier Jungen und zwei Mädchen.
Four boys and two girls.