Final answer:
The Spanish translation of the number 40 is 'cuarenta'.
Step-by-step explanation:
The correct Spanish translation for the number 40 is 'cuarenta'. Spanish numbers are not too difficult to learn. You just need to remember the words for the tens (10, 20, 30, and so on), then you add the word for a unit (1, 2, 3, and so on) if necessary. In this case, 40 translates to 'cuarenta'.
Learn more about Spanish numbers