We look at the division of 643691 by 52 
We want to figure out the number of times 643691 can be divided by 52.

Let's proceed to step 1:
When dividing 6 by 52, we get 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Include the next digit (4) from the dividend after 6, then repeat: 64 / 52

Advancing to step 2:
When dividing 64 by 52, we get 1 with a remainder of 12.
The next digit of our result is 1. 
Result so far: 1.0
If we take 52 away from 64, we end up with 12.
Bring next digit (3) of the dividend behind the 12 and repeat the process: 123 / 52

On to step 3:
52 can be fit into 123 2 times, resulting in a remainder of 19.
Write down 2 as next digit of the result. 
Result so far: 12.0
If we subtract 104 from 123, we get 19.
Append the next digit (6) from the dividend to 19 and continue with: 196 / 52

Advancing to step 4:
When dividing 196 by 52, we get 3 with a remainder of 40.
Write down 3 as next digit of the result. 
Result so far: 123.0
The remainder is 40 after subtracting 156 from 196.
Include the next digit (9) from the dividend after 40, then repeat: 409 / 52

Step 5:
When dividing 409 by 52, we get 7 with a remainder of 45.
Put 7 as the next digit of the answer. 
Result so far: 1237.0
If we subtract 364 from 409, we get 45.
Take the next digit (1) from the dividend and append it to 45, then repeat: 451 / 52

Let's proceed to step 6:
52 goes into 451 8 times with a remainder of 35.
The next digit of our result is 8. 
Result so far: 12378.0
Subtract 416 from 451 to get 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Going ahead to step 7:
350 divided by 52 is 6 with a remainder of 38.
Put 6 as the next digit of the answer. 
Result so far: 12378.6
If we take 312 away from 350, we end up with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Going ahead to step 8:
380 divided by 52 is 7 with a remainder of 16.
Use 7 as the next digit of our solution. 
Result so far: 12378.67
Deduct 364 from 380 and we're left with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

On to step 9:
52 can be fit into 160 3 times, resulting in a remainder of 4.
Use 3 as the next digit of our solution. 
Result so far: 12378.673
Deduct 156 from 160 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 10:
The number 52 fits into 40 0 times, leaving a remainder of 40.
The next digit of our result is 0. 
Result so far: 12378.673
If we subtract 0 from 40, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Step 11:
52 goes into 400 7 times with a remainder of 36.
Use 7 as the next digit of our solution. 
Result so far: 12378.67307
Deduct 364 from 400 and we're left with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

On to step 12:
When dividing 360 by 52, we get 6 with a remainder of 48.
Use 6 as the next digit of our solution. 
Result so far: 12378.673076
Deduct 312 from 360 and we're left with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

On to step 13:
480 divided by 52 is 9 with a remainder of 12.
Use 9 as the next digit of our solution. 
Result so far: 12378.6730769
Subtracting 468 from 480 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 14:
120 divided by 52 is 2 with a remainder of 16.
The number 2 becomes the next digit in our result. 
Result so far: 12378.67307692
If we take 104 away from 120, we end up with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

The final result is 12378.67307692 with a remainder of 1.6e-08.