349639 divided by 21 
Our goal is to divide 349639 by 21.

On to step 1:
If we divide 3 by 21, we get 0 and a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Include the next digit (4) from the dividend after 3, then repeat: 34 / 21

Advancing to step 2:
34 divided by 21 is 1 with a remainder of 13.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 21 from 34 to get 13.
Grab the next digit (9) from the dividend, add it to 13, then carry on: 139 / 21

Advancing to step 3:
The number 21 fits into 139 6 times, leaving a remainder of 13.
Put 6 as the next digit of the answer. 
Result so far: 16.0
Subtract 126 from 139 to get 13.
Bring next digit (6) of the dividend behind the 13 and repeat the process: 136 / 21

Advancing to step 4:
If we divide 136 by 21, we get 6 and a remainder of 10.
The next digit of our result is 6. 
Result so far: 166.0
Subtracting 126 from 136 leaves us with 10.
Take the next digit (3) from the dividend and append it to 10, then repeat: 103 / 21

Moving on to step 5:
103 divided by 21 is 4 with a remainder of 19.
Put 4 as the next digit of the answer. 
Result so far: 1664.0
If we take 84 away from 103, we end up with 19.
Take the next digit (9) from the dividend and append it to 19, then repeat: 199 / 21

Advancing to step 6:
21 can be fit into 199 9 times, resulting in a remainder of 10.
Record the quotient 9 as the next digit in the result. 
Result so far: 16649.0
If we subtract 189 from 199, we get 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 7:
21 goes into 100 4 times with a remainder of 16.
Use 4 as the next digit of our solution. 
Result so far: 16649.4
Subtract 84 from 100 to 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 8:
When dividing 160 by 21, we get 7 with a remainder of 13.
The number 7 becomes the next digit in our result. 
Result so far: 16649.47
The remainder is 13 after subtracting 147 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

On to step 9:
21 can be fit into 130 6 times, resulting in a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 16649.476
If we take 126 away from 130, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 10:
The number 21 fits into 40 1 times, leaving a remainder of 19.
The number 1 becomes the next digit in our result. 
Result so far: 16649.4761
If we take 21 away from 40, we end up with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

On to step 11:
21 goes into 190 9 times with a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 16649.47619
The remainder is 1 after subtracting 189 from 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 12:
If we divide 10 by 21, we get 0 and a remainder of 10.
The next digit of our result is 0. 
Result so far: 16649.47619
Subtract 0 from 10 to get 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.
Write down 4 as next digit of the result. 
Result so far: 16649.4761904
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.

Step 14:
21 can be fit into 160 7 times, resulting in a remainder of 13.
Record the quotient 7 as the next digit in the result. 
Result so far: 16649.47619047
The remainder is 13 after subtracting 147 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Our division results in 16649.47619047 with a remaining 1.3e-08.