170821 ÷ 99 
We're looking to find how many times 99 goes into 170821.

Moving on to step 1:
1 divided by 99 is 0 with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Include the next digit (7) from the dividend after 1, then repeat: 17 / 99

Going ahead to step 2:
When dividing 17 by 99, we get 0 with a remainder of 17.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 17, we get 17.
Bring next digit (0) of the dividend behind the 17 and repeat the process: 170 / 99

Advancing to step 3:
170 divided by 99 is 1 with a remainder of 71.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 99 away from 170, we end up with 71.
Fetch the next digit (8) from the dividend, attach it to 71 and continue: 718 / 99

Let's proceed to step 4:
99 goes into 718 7 times with a remainder of 25.
Use 7 as the next digit of our solution. 
Result so far: 17.0
The remainder is 25 after subtracting 693 from 718.
Grab the next digit (2) from the dividend, add it to 25, then carry on: 252 / 99

Moving on to step 5:
99 goes into 252 2 times with a remainder of 54.
Put 2 as the next digit of the answer. 
Result so far: 172.0
Subtracting 198 from 252 leaves us with 54.
Bring next digit (1) of the dividend behind the 54 and repeat the process: 541 / 99

Moving on to step 6:
When dividing 541 by 99, we get 5 with a remainder of 46.
Write down 5 as next digit of the result. 
Result so far: 1725.0
Subtracting 495 from 541 leaves us with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Moving on to step 7:
99 can be fit into 460 4 times, resulting in a remainder of 64.
The number 4 becomes the next digit in our result. 
Result so far: 1725.4
Deduct 396 from 460 and we're left with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Going ahead to step 8:
When dividing 640 by 99, we get 6 with a remainder of 46.
The number 6 becomes the next digit in our result. 
Result so far: 1725.46
Deduct 594 from 640 and we're left with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Going ahead to step 9:
The number 99 fits into 460 4 times, leaving a remainder of 64.
The number 4 becomes the next digit in our result. 
Result so far: 1725.464
Subtracting 396 from 460 leaves us with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Step 10:
The number 99 fits into 640 6 times, leaving a remainder of 46.
Record the quotient 6 as the next digit in the result. 
Result so far: 1725.4646
Subtract 594 from 640 to get 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Let's proceed to step 11:
99 goes into 460 4 times with a remainder of 64.
Put 4 as the next digit of the answer. 
Result so far: 1725.46464
If we subtract 396 from 460, we get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Let's proceed to step 12:
The number 99 fits into 640 6 times, leaving a remainder of 46.
Use 6 as the next digit of our solution. 
Result so far: 1725.464646
Subtracting 594 from 640 leaves us with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Going ahead to step 13:
When dividing 460 by 99, we get 4 with a remainder of 64.
The next digit of our result is 4. 
Result so far: 1725.4646464
Subtracting 396 from 460 leaves us with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Advancing to step 14:
If we divide 640 by 99, we get 6 and a remainder of 46.
Record the quotient 6 as the next digit in the result. 
Result so far: 1725.46464646
If we subtract 594 from 640, we get 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

The final outcome is 1725.46464646, with a leftover of 4.6e-08.