In the above listening exercise, I hear a number and write it in words but got it wrong even though the number was correct. Why was itwrong?

Hola Laurine

The reason why you were marked wrong despite getting the right number (in letters) is because there is a hint there asking to write it in digits as decimal numbers are written in digits as per RAE recommendations. However, as dictations are self-scoring exercises, I think you should give yourself a high mark on that one if the number was spelled right, I'd say. 

I hope this helps.

Kind regards

Inma