We're dividing 390604 by 53 
We want to figure out the number of times 390604 can be divided by 53.

Step 1:
53 can be fit into 3 0 times, resulting in a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 53

Advancing to step 2:
When dividing 39 by 53, we get 0 with a remainder of 39.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 39 leaves us with 39.
Take the next digit (0) from the dividend and append it to 39, then repeat: 390 / 53

Step 3:
390 divided by 53 is 7 with a remainder of 19.
Use 7 as the next digit of our solution. 
Result so far: 7.0
The remainder is 19 after subtracting 371 from 390.
Include the next digit (6) from the dividend after 19, then repeat: 196 / 53

Let's proceed to step 4:
The number 53 fits into 196 3 times, leaving a remainder of 37.
Write down 3 as next digit of the result. 
Result so far: 73.0
If we subtract 159 from 196, we get 37.
Grab the next digit (0) from the dividend, add it to 37, then carry on: 370 / 53

On to step 5:
If we divide 370 by 53, we get 6 and a remainder of 52.
The next digit of our result is 6. 
Result so far: 736.0
The remainder is 52 after subtracting 318 from 370.
Include the next digit (4) from the dividend after 52, then repeat: 524 / 53

Step 6:
53 goes into 524 9 times with a remainder of 47.
Put 9 as the next digit of the answer. 
Result so far: 7369.0
If we subtract 477 from 524, we get 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Moving on to step 7:
53 goes into 470 8 times with a remainder of 46.
Use 8 as the next digit of our solution. 
Result so far: 7369.8
Deduct 424 from 470 and we're left with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

On to step 8:
The number 53 fits into 460 8 times, leaving a remainder of 36.
The number 8 becomes the next digit in our result. 
Result so far: 7369.88
Subtract 424 from 460 to get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

After the division, we end up with 7369.88 and a remainder of 0.036.