338236 divided by 21 
Our goal is to divide 338236 by 21.

On to step 1:
If we divide 3 by 21, we get 0 and a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Fetch the next digit (3) from the dividend, attach it to 3 and continue: 33 / 21

On to step 2:
If we divide 33 by 21, we get 1 and a remainder of 12.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Deduct 21 from 33 and we're left with 12.
Include the next digit (8) from the dividend after 12, then repeat: 128 / 21

Moving on to step 3:
128 divided by 21 is 6 with a remainder of 2.
Record the quotient 6 as the next digit in the result. 
Result so far: 16.0
The remainder is 2 after subtracting 126 from 128.
Grab the next digit (2) from the dividend, add it to 2, then carry on: 22 / 21

Going ahead to step 4:
If we divide 22 by 21, we get 1 and a remainder of 1.
Put 1 as the next digit of the answer. 
Result so far: 161.0
Subtracting 21 from 22 leaves us with 1.
Include the next digit (3) from the dividend after 1, then repeat: 13 / 21

Going ahead to step 5:
21 goes into 13 0 times with a remainder of 13.
Write down 0 as next digit of the result. 
Result so far: 1610.0
Subtract 0 from 13 to get 13.
Bring next digit (6) of the dividend behind the 13 and repeat the process: 136 / 21

Going ahead to step 6:
The number 21 fits into 136 6 times, leaving a remainder of 10.
The number 6 becomes the next digit in our result. 
Result so far: 16106.0
Deduct 126 from 136 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 7:
If we divide 100 by 21, we get 4 and a remainder of 16.
Use 4 as the next digit of our solution. 
Result so far: 16106.4
If we subtract 84 from 100, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

On to step 8:
160 divided by 21 is 7 with a remainder of 13.
The next digit of our result is 7. 
Result so far: 16106.47
If we take 147 away from 160, we end up with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Advancing to step 9:
When dividing 130 by 21, we get 6 with a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 16106.476
Subtract 126 from 130 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 10:
21 goes into 40 1 times with a remainder of 19.
Put 1 as the next digit of the answer. 
Result so far: 16106.4761
The remainder is 19 after subtracting 21 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Step 11:
190 divided by 21 is 9 with a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 16106.47619
If we subtract 189 from 190, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 12:
21 goes into 10 0 times with a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 16106.47619
Deduct 0 from 10 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 13:
When dividing 100 by 21, we get 4 with a remainder of 16.
Put 4 as the next digit of the answer. 
Result so far: 16106.4761904
If we subtract 84 from 100, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Moving on to step 14:
If we divide 160 by 21, we get 7 and a remainder of 13.
The next digit of our result is 7. 
Result so far: 16106.47619047
Deduct 147 from 160 and we're left with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

After the division, we end up with 16106.47619047 and a remainder of 1.3e-08.