How do you say 9 40 in spanish?

Answer 1

if you mean just the numbers, it would be "diez" and "cuarenta"

If you mean the time, it could be ")Son las) diez y cuarenta" = "(It's) 10.40."

or

"Son las once menos veinte" = "It's 20 to 11".

Answer 2

Son las cinco y cuarenta (It's 5.40)

Son las seis menos veinte (It's 20 to 6)

Answer 3

Translation: las diez menos veinte