Hello, thank you. We got the same answer but I'm more curious how do we have to write the working on the paper? Like how you wrote will be better?

The Grey table would be the workings. In my opinion, if the qn is worth 2 marks, you can exclude the comments. If it is worth 3 or 4 marks, include the comments. You can also add:
1) Given tens digit is twice hundreds digit, hence tens digit can be (2,4,6,8) & hundreds digit can be (1,2,3,4)
2) Given 4 digit number is odd and can be divided exactly by 5, hence ones digit has to be 5.