We're dividing 394319 by 21 
We want to divide 394319 by 21.

On to step 1:
21 goes into 3 0 times with a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Take the next digit (9) from the dividend and append it to 3, then repeat: 39 / 21

Moving on to step 2:
If we divide 39 by 21, we get 1 and a remainder of 18.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Deduct 21 from 39 and we're left with 18.
Grab the next digit (4) from the dividend, add it to 18, then carry on: 184 / 21

Advancing to step 3:
The number 21 fits into 184 8 times, leaving a remainder of 16.
Record the quotient 8 as the next digit in the result. 
Result so far: 18.0
Deduct 168 from 184 and we're left with 16.
Fetch the next digit (3) from the dividend, attach it to 16 and continue: 163 / 21

Moving on to step 4:
The number 21 fits into 163 7 times, leaving a remainder of 16.
Record the quotient 7 as the next digit in the result. 
Result so far: 187.0
If we take 147 away from 163, we end up with 16.
Append the next digit (1) from the dividend to 16 and continue with: 161 / 21

Going ahead to step 5:
The number 21 fits into 161 7 times, leaving a remainder of 14.
Write down 7 as next digit of the result. 
Result so far: 1877.0
If we subtract 147 from 161, we get 14.
Append the next digit (9) from the dividend to 14 and continue with: 149 / 21

Let's proceed to step 6:
21 goes into 149 7 times with a remainder of 2.
Record the quotient 7 as the next digit in the result. 
Result so far: 18777.0
If we take 147 away from 149, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 7:
21 goes into 20 0 times with a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 18777.0
If we take 0 away from 20, we end up 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.

Advancing to step 8:
200 divided by 21 is 9 with a remainder of 11.
Record the quotient 9 as the next digit in the result. 
Result so far: 18777.09
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.

Let's proceed to step 9:
If we divide 110 by 21, we get 5 and a remainder of 5.
The next digit of our result is 5. 
Result so far: 18777.095
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.

On to step 10:
50 divided by 21 is 2 with a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 18777.0952
Deduct 42 from 50 and we're left 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.

On to step 11:
80 divided by 21 is 3 with a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 18777.09523
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.

Moving on to step 12:
The number 21 fits into 170 8 times, leaving a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 18777.095238
Deduct 168 from 170 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 13:
21 goes into 20 0 times with a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 18777.095238
If we subtract 0 from 20, we 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.

On to step 14:
21 can be fit into 200 9 times, resulting in a remainder of 11.
Use 9 as the next digit of our solution. 
Result so far: 18777.09523809
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.

The final result is 18777.09523809 with a remainder of 1.1e-08.