We're dividing 164322 by 21 
We want to figure out the number of times 164322 can be divided by 21.

On to step 1:
21 can be fit into 1 0 times, resulting in 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 (6) from the dividend after 1, then repeat: 16 / 21

Moving on to step 2:
When dividing 16 by 21, we get 0 with a remainder of 16.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 16 leaves us with 16.
Grab the next digit (4) from the dividend, add it to 16, then carry on: 164 / 21

Advancing to step 3:
If we divide 164 by 21, we get 7 and a remainder of 17.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
Subtracting 147 from 164 leaves us with 17.
Bring next digit (3) of the dividend behind the 17 and repeat the process: 173 / 21

Going ahead to step 4:
21 can be fit into 173 8 times, resulting in a remainder of 5.
Put 8 as the next digit of the answer. 
Result so far: 78.0
Subtract 168 from 173 to get 5.
Bring next digit (2) of the dividend behind the 5 and repeat the process: 52 / 21

Step 5:
The number 21 fits into 52 2 times, leaving a remainder of 10.
Record the quotient 2 as the next digit in the result. 
Result so far: 782.0
If we take 42 away from 52, we end up with 10.
Fetch the next digit (2) from the dividend, attach it to 10 and continue: 102 / 21

On to step 6:
102 divided by 21 is 4 with a remainder of 18.
Put 4 as the next digit of the answer. 
Result so far: 7824.0
The remainder is 18 after subtracting 84 from 102.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Moving on to step 7:
180 divided by 21 is 8 with a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 7824.8
Subtracting 168 from 180 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 8:
120 divided by 21 is 5 with a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 7824.85
Subtracting 105 from 120 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 9:
When dividing 150 by 21, we get 7 with a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 7824.857
Subtract 147 from 150 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 10:
21 can be fit into 30 1 times, resulting in a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 7824.8571
The remainder is 9 after subtracting 21 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 11:
The number 21 fits into 90 4 times, leaving a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 7824.85714
Deduct 84 from 90 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 12:
If we divide 60 by 21, we get 2 and a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 7824.857142
Deduct 42 from 60 and we're left with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Advancing to step 13:
The number 21 fits into 180 8 times, leaving a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 7824.8571428
If we subtract 168 from 180, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 14:
21 goes into 120 5 times with a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 7824.85714285
If we take 105 away from 120, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

The final result is 7824.85714285 with a remainder of 1.5e-08.