Let's divide 53509851 by 816
We're looking to find how many times 816 goes into 53509851.

Going ahead to step 1:
The number 816 fits into 5 0 times, leaving a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Take the next digit (3) from the dividend and append it to 5, then repeat: 53 / 816

Advancing to step 2:
When dividing 53 by 816, we get 0 with a remainder of 53.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 53 and we're left with 53.
Bring next digit (5) of the dividend behind the 53 and repeat the process: 535 / 816

Advancing to step 3:
816 can be fit into 535 0 times, resulting in a remainder of 535.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 535 to get 535.
Take the next digit (0) from the dividend and append it to 535, then repeat: 5350 / 816

Let's proceed to step 4:
If we divide 5350 by 816, we get 6 and a remainder of 454.
Use 6 as the next digit of our solution. 
Result so far: 6.0
Subtracting 4896 from 5350 leaves us with 454.
Grab the next digit (9) from the dividend, add it to 454, then carry on: 4549 / 816

Let's proceed to step 5:
816 goes into 4549 5 times with a remainder of 469.
Record the quotient 5 as the next digit in the result. 
Result so far: 65.0
If we take 4080 away from 4549, we end up with 469.
Include the next digit (8) from the dividend after 469, then repeat: 4698 / 816

Step 6:
4698 divided by 816 is 5 with a remainder of 618.
The number 5 becomes the next digit in our result. 
Result so far: 655.0
Deduct 4080 from 4698 and we're left with 618.
Fetch the next digit (5) from the dividend, attach it to 618 and continue: 6185 / 816

On to step 7:
816 goes into 6185 7 times with a remainder of 473.
Use 7 as the next digit of our solution. 
Result so far: 6557.0
If we take 5712 away from 6185, we end up with 473.
Grab the next digit (1) from the dividend, add it to 473, then carry on: 4731 / 816

On to step 8:
4731 divided by 816 is 5 with a remainder of 651.
Write down 5 as next digit of the result. 
Result so far: 65575.0
Subtracting 4080 from 4731 leaves us with 651.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6510, and continue the process.

Advancing to step 9:
816 goes into 6510 7 times with a remainder of 798.
Write down 7 as next digit of the result. 
Result so far: 65575.7
If we take 5712 away from 6510, we end up with 798.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7980, and continue the process.

Advancing to step 10:
7980 divided by 816 is 9 with a remainder of 636.
The next digit of our result is 9. 
Result so far: 65575.79
Subtracting 7344 from 7980 leaves us with 636.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6360, and continue the process.

On to step 11:
816 can be fit into 6360 7 times, resulting in a remainder of 648.
The number 7 becomes the next digit in our result. 
Result so far: 65575.797
If we take 5712 away from 6360, we end up 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.

On to step 12:
If we divide 6480 by 816, we get 7 and a remainder of 768.
Put 7 as the next digit of the answer. 
Result so far: 65575.7977
Subtracting 5712 from 6480 leaves us with 768.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7680, and continue the process.

After the division, we end up with 65575.7977 and a remainder of 0.00768.