We divide 343646 by 21
Let's see how many times 21 fits into 343646.

Moving on to step 1:
21 can be fit into 3 0 times, resulting in a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Fetch the next digit (4) from the dividend, attach it to 3 and continue: 34 / 21

Moving on to step 2:
21 can be fit into 34 1 times, resulting in a remainder of 13.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 21 from 34 to get 13.
Grab the next digit (3) from the dividend, add it to 13, then carry on: 133 / 21

On to step 3:
21 goes into 133 6 times with a remainder of 7.
The number 6 becomes the next digit in our result. 
Result so far: 16.0
Subtracting 126 from 133 leaves us with 7.
Grab the next digit (6) from the dividend, add it to 7, then carry on: 76 / 21

Going ahead to step 4:
If we divide 76 by 21, we get 3 and a remainder of 13.
Put 3 as the next digit of the answer. 
Result so far: 163.0
Subtract 63 from 76 to get 13.
Include the next digit (4) from the dividend after 13, then repeat: 134 / 21

On to step 5:
If we divide 134 by 21, we get 6 and a remainder of 8.
Put 6 as the next digit of the answer. 
Result so far: 1636.0
If we subtract 126 from 134, we get 8.
Bring next digit (6) of the dividend behind the 8 and repeat the process: 86 / 21

Moving on to step 6:
21 can be fit into 86 4 times, resulting in a remainder of 2.
Write down 4 as next digit of the result. 
Result so far: 16364.0
The remainder is 2 after subtracting 84 from 86.
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 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: 16364.0
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.

Step 8:
21 goes into 200 9 times with a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 16364.09
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.

Step 9:
110 divided by 21 is 5 with a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 16364.095
Subtract 105 from 110 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Let's proceed to step 10:
21 goes into 50 2 times with a remainder of 8.
The next digit of our result is 2. 
Result so far: 16364.0952
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.

Step 11:
When dividing 80 by 21, we get 3 with a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 16364.09523
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.

Step 12:
The number 21 fits into 170 8 times, leaving a remainder of 2.
The next digit of our result is 8. 
Result so far: 16364.095238
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.

Going ahead to step 13:
20 divided by 21 is 0 with a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 16364.095238
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 14:
The number 21 fits into 200 9 times, leaving a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 16364.09523809
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.

The quotient of the division is 16364.09523809, and the remainder is 1.1e-08.