We're dividing 53178908 by 621 
Our goal is to divide 53178908 by 621.

Going ahead to step 1:
The number 621 fits into 5 0 times, leaving a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Grab the next digit (3) from the dividend, add it to 5, then carry on: 53 / 621

Advancing to step 2:
53 divided by 621 is 0 with a remainder of 53.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 53 and we're left with 53.
Include the next digit (1) from the dividend after 53, then repeat: 531 / 621

Moving on to step 3:
621 goes into 531 0 times with a remainder of 531.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 531 to get 531.
Append the next digit (7) from the dividend to 531 and continue with: 5317 / 621

Let's proceed to step 4:
621 goes into 5317 8 times with a remainder of 349.
Put 8 as the next digit of the answer. 
Result so far: 8.0
Subtract 4968 from 5317 to get 349.
Grab the next digit (8) from the dividend, add it to 349, then carry on: 3498 / 621

On to step 5:
The number 621 fits into 3498 5 times, leaving a remainder of 393.
The number 5 becomes the next digit in our result. 
Result so far: 85.0
If we subtract 3105 from 3498, we get 393.
Take the next digit (9) from the dividend and append it to 393, then repeat: 3939 / 621

On to step 6:
The number 621 fits into 3939 6 times, leaving a remainder of 213.
Put 6 as the next digit of the answer. 
Result so far: 856.0
If we subtract 3726 from 3939, we get 213.
Include the next digit (0) from the dividend after 213, then repeat: 2130 / 621

Going ahead to step 7:
621 can be fit into 2130 3 times, resulting in a remainder of 267.
The number 3 becomes the next digit in our result. 
Result so far: 8563.0
Deduct 1863 from 2130 and we're left with 267.
Take the next digit (8) from the dividend and append it to 267, then repeat: 2678 / 621

Going ahead to step 8:
When dividing 2678 by 621, we get 4 with a remainder of 194.
Write down 4 as next digit of the result. 
Result so far: 85634.0
If we subtract 2484 from 2678, we get 194.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1940, and continue the process.

Let's proceed to step 9:
621 can be fit into 1940 3 times, resulting in a remainder of 77.
Put 3 as the next digit of the answer. 
Result so far: 85634.3
The remainder is 77 after subtracting 1863 from 1940.
Since there are no more digits in the dividend, we add a zero to the remainder making it 770, and continue the process.

On to step 10:
If we divide 770 by 621, we get 1 and a remainder of 149.
Write down 1 as next digit of the result. 
Result so far: 85634.31
Subtract 621 from 770 to get 149.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1490, and continue the process.

Step 11:
The number 621 fits into 1490 2 times, leaving a remainder of 248.
The number 2 becomes the next digit in our result. 
Result so far: 85634.312
If we subtract 1242 from 1490, we get 248.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2480, and continue the process.

On to step 12:
621 can be fit into 2480 3 times, resulting in a remainder of 617.
Put 3 as the next digit of the answer. 
Result so far: 85634.3123
Subtract 1863 from 2480 to get 617.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6170, and continue the process.

Advancing to step 13:
When dividing 6170 by 621, we get 9 with a remainder of 581.
Use 9 as the next digit of our solution. 
Result so far: 85634.31239
The remainder is 581 after subtracting 5589 from 6170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5810, and continue the process.

Advancing to step 14:
When dividing 5810 by 621, we get 9 with a remainder of 221.
Put 9 as the next digit of the answer. 
Result so far: 85634.312399
Deduct 5589 from 5810 and we're left with 221.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2210, and continue the process.

After the division, we end up with 85634.312399 and a remainder of 2.21e-05.