812151 ÷ 99 
Let's see how many times 99 fits into 812151.

Step 1:
If we divide 8 by 99, we get 0 and a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Bring next digit (1) of the dividend behind the 8 and repeat the process: 81 / 99

On to step 2:
99 goes into 81 0 times with a remainder of 81.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 81 leaves us with 81.
Take the next digit (2) from the dividend and append it to 81, then repeat: 812 / 99

Let's proceed to step 3:
When dividing 812 by 99, we get 8 with a remainder of 20.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
Deduct 792 from 812 and we're left with 20.
Grab the next digit (1) from the dividend, add it to 20, then carry on: 201 / 99

Step 4:
If we divide 201 by 99, we get 2 and a remainder of 3.
Write down 2 as next digit of the result. 
Result so far: 82.0
If we subtract 198 from 201, we get 3.
Include the next digit (5) from the dividend after 3, then repeat: 35 / 99

On to step 5:
The number 99 fits into 35 0 times, leaving a remainder of 35.
The number 0 becomes the next digit in our result. 
Result so far: 820.0
Subtracting 0 from 35 leaves us with 35.
Grab the next digit (1) from the dividend, add it to 35, then carry on: 351 / 99

Advancing to step 6:
99 goes into 351 3 times with a remainder of 54.
The number 3 becomes the next digit in our result. 
Result so far: 8203.0
Subtracting 297 from 351 leaves us with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Advancing to step 7:
540 divided by 99 is 5 with a remainder of 45.
The number 5 becomes the next digit in our result. 
Result so far: 8203.5
If we take 495 away from 540, we end up with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Going ahead to step 8:
When dividing 450 by 99, we get 4 with a remainder of 54.
Use 4 as the next digit of our solution. 
Result so far: 8203.54
Subtracting 396 from 450 leaves us with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

On to step 9:
540 divided by 99 is 5 with a remainder of 45.
Use 5 as the next digit of our solution. 
Result so far: 8203.545
Subtract 495 from 540 to get 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Going ahead to step 10:
450 divided by 99 is 4 with a remainder of 54.
Record the quotient 4 as the next digit in the result. 
Result so far: 8203.5454
Deduct 396 from 450 and we're left with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Going ahead to step 11:
540 divided by 99 is 5 with a remainder of 45.
Use 5 as the next digit of our solution. 
Result so far: 8203.54545
Subtracting 495 from 540 leaves us with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Going ahead to step 12:
If we divide 450 by 99, we get 4 and a remainder of 54.
The number 4 becomes the next digit in our result. 
Result so far: 8203.545454
If we subtract 396 from 450, we get 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Advancing to step 13:
99 can be fit into 540 5 times, resulting in a remainder of 45.
Put 5 as the next digit of the answer. 
Result so far: 8203.5454545
If we subtract 495 from 540, we get 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Going ahead to step 14:
99 goes into 450 4 times with a remainder of 54.
Record the quotient 4 as the next digit in the result. 
Result so far: 8203.54545454
Subtracting 396 from 450 leaves us with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

The final result is 8203.54545454 with a remainder of 5.4e-08.