40,000
Three thousand forty = 3,040
40,000 = forty thousand 7 = seven 40,007
4,040,000 Four Million and Forty Thousand
Forty-two thousand can be written as 42,000.
I would write, one thousand, three hundred and forty as: 1,340
Forty five thousand
Forty-one thousand, twenty
40,840
44,044
One hundred forty thousand
That is the correct spelling (forty thousand) for the numeral 40000 or 40,000.
Forty-eight thousand, two