Alright, ready to do some subtraction? We're taking 843504885 and subtracting 213450925 from it.

Step 1: We'll start by subtracting the digit 5 and the borrow 0 from 5 in column 1 and get 0.
0 is the first digit of our result.

Step 2: We'll start by subtracting the digit 2 and the borrow 0 from 8 in column 2 and get 6.
6 is the next digit of our result.

Step 3: We'll start by subtracting the digit 9 and the borrow 0 from 8 in column 3 and get -1.
We add -1 to 10 and get 9 as the next digit of the result.

Step 4: We'll start by subtracting the digit 0 and the borrow 1 from 4 in column 4 and get 3.
3 is the next digit of our result.

Step 5: We'll start by subtracting the digit 5 and the borrow 0 from 0 in column 5 and get -5.
We add -5 to 10 and get 5 as the next digit of the result.

Step 6: We'll start by subtracting the digit 4 and the borrow 1 from 5 in column 6 and get 0.
0 is the next digit of our result.

Step 7: We'll start by subtracting the digit 3 and the borrow 0 from 3 in column 7 and get 0.
0 is the next digit of our result.

Step 8: We'll start by subtracting the digit 1 and the borrow 0 from 4 in column 8 and get 3.
3 is the next digit of our result.

Step 9: We'll start by subtracting the digit 2 and the borrow 0 from 8 in column 9 and get 6.
6 is the next digit of our result.

So, 843504885 - 213450925 = 630053960.