Answer:
The importance is that it gives a more strong impression for the readers. Because, when we read we don't usually like typo's as it creates misunderstanding.
so, following a uniform rule in writing number and spelling in academic writing provides consistency in our writing. It also allow us, writers, to get our message to the readers in a clear and understandable way.
That's all! If you want you can also add your own thoughts :>
Have a great day!
