Yes, forty is the correct spelling for the number 40.
Forty = vierzig
You had it right. It is forty.
forty three
You spell it like this: Forty Five dollars.....
That is the correct spelling of "forty" (40).
forty
Forty one is einundvierzig.
Forty.
"Forty thousand" in numbers is "40,000"
You spell 44 as forty four.
47 is spelled out, 'forty-seven'.
six hundred and forty...or 640