In this question, you are given a standard form number and asked to write it in word form. To do this, it will be easier to break the number into multiple part of 3 number. It will become:
1. 904
This part doesn't need to add any word. It will become "nine hundred and four"
2. 324
This part will be added "thousands". It will become " three hundred and twenty-four thousand"
Combining them, you will got "three hundred and twenty-four thousand, nine hundred and four"
