991682 ÷ 21 
Our goal is to divide 991682 by 21.

Advancing to step 1:
If we divide 9 by 21, we get 0 and a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Bring next digit (9) of the dividend behind the 9 and repeat the process: 99 / 21

Step 2:
When dividing 99 by 21, we get 4 with a remainder of 15.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
If we subtract 84 from 99, we get 15.
Include the next digit (1) from the dividend after 15, then repeat: 151 / 21

Let's proceed to step 3:
If we divide 151 by 21, we get 7 and a remainder of 4.
Put 7 as the next digit of the answer. 
Result so far: 47.0
Subtracting 147 from 151 leaves us with 4.
Bring next digit (6) of the dividend behind the 4 and repeat the process: 46 / 21

Moving on to step 4:
When dividing 46 by 21, we get 2 with a remainder of 4.
Use 2 as the next digit of our solution. 
Result so far: 472.0
If we subtract 42 from 46, we get 4.
Bring next digit (8) of the dividend behind the 4 and repeat the process: 48 / 21

Advancing to step 5:
21 can be fit into 48 2 times, resulting in a remainder of 6.
Put 2 as the next digit of the answer. 
Result so far: 4722.0
The remainder is 6 after subtracting 42 from 48.
Grab the next digit (2) from the dividend, add it to 6, then carry on: 62 / 21

Let's proceed to step 6:
When dividing 62 by 21, we get 2 with a remainder of 20.
The number 2 becomes the next digit in our result. 
Result so far: 47222.0
Subtracting 42 from 62 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 7:
200 divided by 21 is 9 with a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 47222.9
If we take 189 away from 200, we end up with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Going ahead to step 8:
21 can be fit into 110 5 times, resulting in a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 47222.95
If we take 105 away from 110, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 9:
If we divide 50 by 21, we get 2 and a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 47222.952
If we take 42 away from 50, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 10:
The number 21 fits into 80 3 times, leaving a remainder of 17.
Record the quotient 3 as the next digit in the result. 
Result so far: 47222.9523
The remainder is 17 after subtracting 63 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Moving on to step 11:
If we divide 170 by 21, we get 8 and a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 47222.95238
Subtract 168 from 170 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 12:
When dividing 20 by 21, we get 0 with a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 47222.95238
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 13:
200 divided by 21 is 9 with a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 47222.9523809
The remainder is 11 after subtracting 189 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 14:
21 can be fit into 110 5 times, resulting in a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 47222.95238095
Deduct 105 from 110 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

The final outcome is 47222.95238095, with a leftover of 5e-09.