53129173 divided by 808 
We want to figure out the number of times 53129173 can be divided by 808.

Advancing to step 1:
The number 808 fits into 5 0 times, leaving a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Take the next digit (3) from the dividend and append it to 5, then repeat: 53 / 808

Advancing to step 2:
When dividing 53 by 808, we get 0 with a remainder of 53.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 53 after subtracting 0 from 53.
Fetch the next digit (1) from the dividend, attach it to 53 and continue: 531 / 808

Step 3:
If we divide 531 by 808, we get 0 and a remainder of 531.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 531, we end up with 531.
Grab the next digit (2) from the dividend, add it to 531, then carry on: 5312 / 808

On to step 4:
The number 808 fits into 5312 6 times, leaving a remainder of 464.
Record the quotient 6 as the next digit in the result. 
Result so far: 6.0
Subtracting 4848 from 5312 leaves us with 464.
Append the next digit (9) from the dividend to 464 and continue with: 4649 / 808

Going ahead to step 5:
808 can be fit into 4649 5 times, resulting in a remainder of 609.
Put 5 as the next digit of the answer. 
Result so far: 65.0
The remainder is 609 after subtracting 4040 from 4649.
Fetch the next digit (1) from the dividend, attach it to 609 and continue: 6091 / 808

Moving on to step 6:
The number 808 fits into 6091 7 times, leaving a remainder of 435.
The number 7 becomes the next digit in our result. 
Result so far: 657.0
If we take 5656 away from 6091, we end up with 435.
Grab the next digit (7) from the dividend, add it to 435, then carry on: 4357 / 808

Advancing to step 7:
808 goes into 4357 5 times with a remainder of 317.
Use 5 as the next digit of our solution. 
Result so far: 6575.0
The remainder is 317 after subtracting 4040 from 4357.
Append the next digit (3) from the dividend to 317 and continue with: 3173 / 808

Advancing to step 8:
If we divide 3173 by 808, we get 3 and a remainder of 749.
The number 3 becomes the next digit in our result. 
Result so far: 65753.0
If we take 2424 away from 3173, we end up with 749.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7490, and continue the process.

Let's proceed to step 9:
If we divide 7490 by 808, we get 9 and a remainder of 218.
Use 9 as the next digit of our solution. 
Result so far: 65753.9
If we take 7272 away from 7490, we end up with 218.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2180, and continue the process.

Going ahead to step 10:
808 can be fit into 2180 2 times, resulting in a remainder of 564.
The number 2 becomes the next digit in our result. 
Result so far: 65753.92
Subtract 1616 from 2180 to get 564.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5640, and continue the process.

Let's proceed to step 11:
When dividing 5640 by 808, we get 6 with a remainder of 792.
The number 6 becomes the next digit in our result. 
Result so far: 65753.926
The remainder is 792 after subtracting 4848 from 5640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7920, and continue the process.

Going ahead to step 12:
If we divide 7920 by 808, we get 9 and a remainder of 648.
The next digit of our result is 9. 
Result so far: 65753.9269
If we subtract 7272 from 7920, we get 648.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6480, and continue the process.

Let's proceed to step 13:
When dividing 6480 by 808, we get 8 with a remainder of 16.
Use 8 as the next digit of our solution. 
Result so far: 65753.92698
If we subtract 6464 from 6480, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Advancing to step 14:
The number 808 fits into 160 0 times, leaving a remainder of 160.
Write down 0 as next digit of the result. 
Result so far: 65753.92698
If we subtract 0 from 160, we get 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Step 15:
If we divide 1600 by 808, we get 1 and a remainder of 792.
Write down 1 as next digit of the result. 
Result so far: 65753.9269801
The remainder is 792 after subtracting 808 from 1600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7920, and continue the process.

Moving on to step 16:
If we divide 7920 by 808, we get 9 and a remainder of 648.
Write down 9 as next digit of the result. 
Result so far: 65753.92698019
Deduct 7272 from 7920 and we're left with 648.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6480, and continue the process.

The final outcome is 65753.92698019, with a leftover of 6.48e-07.