We're dividing 166382 by 21 
We're looking to find how many times 21 goes into 166382.

Moving on to step 1:
21 can be fit into 1 0 times, resulting in a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Take the next digit (6) from the dividend and append it to 1, then repeat: 16 / 21

Going ahead to step 2:
21 can be fit into 16 0 times, resulting in a remainder of 16.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 16 after subtracting 0 from 16.
Include the next digit (6) from the dividend after 16, then repeat: 166 / 21

Advancing to step 3:
The number 21 fits into 166 7 times, leaving a remainder of 19.
The next digit of our result is 7. 
Result so far: 7.0
Subtract 147 from 166 to get 19.
Take the next digit (3) from the dividend and append it to 19, then repeat: 193 / 21

Advancing to step 4:
The number 21 fits into 193 9 times, leaving a remainder of 4.
Use 9 as the next digit of our solution. 
Result so far: 79.0
The remainder is 4 after subtracting 189 from 193.
Include the next digit (8) from the dividend after 4, then repeat: 48 / 21

Step 5:
21 goes into 48 2 times with a remainder of 6.
Write down 2 as next digit of the result. 
Result so far: 792.0
Deduct 42 from 48 and we're left with 6.
Bring next digit (2) of the dividend behind the 6 and repeat the process: 62 / 21

On to step 6:
The number 21 fits into 62 2 times, leaving a remainder of 20.
The number 2 becomes the next digit in our result. 
Result so far: 7922.0
Subtract 42 from 62 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 7:
21 can be fit into 200 9 times, resulting in a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 7922.9
Subtract 189 from 200 to get 11.
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 8:
The number 21 fits into 110 5 times, leaving a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 7922.95
Subtracting 105 from 110 leaves us 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.

Step 9:
If we divide 50 by 21, we get 2 and a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 7922.952
The remainder is 8 after subtracting 42 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 10:
The number 21 fits into 80 3 times, leaving a remainder of 17.
Write down 3 as next digit of the result. 
Result so far: 7922.9523
If we subtract 63 from 80, we get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Let's proceed to step 11:
170 divided by 21 is 8 with a remainder of 2.
The number 8 becomes the next digit in our result. 
Result so far: 7922.95238
If we subtract 168 from 170, we 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:
20 divided by 21 is 0 with a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 7922.95238
The remainder is 20 after subtracting 0 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 13:
200 divided by 21 is 9 with a remainder of 11.
The next digit of our result is 9. 
Result so far: 7922.9523809
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.

On to step 14:
21 goes into 110 5 times with a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 7922.95238095
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.

In conclusion, the division gives 7922.95238095 with a balance of 5e-09.