i know its answer is 90, but i want that some one explain step by step to me.

let me say

when i say 540 divided by 6, so first i will multiply 6 with 9 so i willl put 54 under 54 right, no tell me that what i will do with the 0?
same case is with 541, that when i will put 54 under 54, so wht i will do with 1?