Let's divide 337916 by 21
We want to divide 337916 by 21.

Advancing to step 1:
3 divided by 21 is 0 with a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Append the next digit (3) from the dividend to 3 and continue with: 33 / 21

Step 2:
21 goes into 33 1 times with a remainder of 12.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtract 21 from 33 to get 12.
Include the next digit (7) from the dividend after 12, then repeat: 127 / 21

Advancing to step 3:
The number 21 fits into 127 6 times, leaving a remainder of 1.
Put 6 as the next digit of the answer. 
Result so far: 16.0
Deduct 126 from 127 and we're left with 1.
Bring next digit (9) of the dividend behind the 1 and repeat the process: 19 / 21

Let's proceed to step 4:
When dividing 19 by 21, we get 0 with a remainder of 19.
Record the quotient 0 as the next digit in the result. 
Result so far: 160.0
Subtracting 0 from 19 leaves us with 19.
Bring next digit (1) of the dividend behind the 19 and repeat the process: 191 / 21

Moving on to step 5:
The number 21 fits into 191 9 times, leaving a remainder of 2.
Record the quotient 9 as the next digit in the result. 
Result so far: 1609.0
If we take 189 away from 191, we end up with 2.
Grab the next digit (6) from the dividend, add it to 2, then carry on: 26 / 21

Advancing to step 6:
When dividing 26 by 21, we get 1 with a remainder of 5.
Use 1 as the next digit of our solution. 
Result so far: 16091.0
The remainder is 5 after subtracting 21 from 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 7:
21 can be fit into 50 2 times, resulting in a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 16091.2
If we subtract 42 from 50, we get 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 8:
21 can be fit into 80 3 times, resulting in a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 16091.23
Deduct 63 from 80 and we're left with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Going ahead to step 9:
21 goes into 170 8 times with a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 16091.238
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.

Moving on to step 10:
The number 21 fits into 20 0 times, leaving a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 16091.238
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 11:
21 goes into 200 9 times with a remainder of 11.
Record the quotient 9 as the next digit in the result. 
Result so far: 16091.23809
Subtracting 189 from 200 leaves us 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.

Going ahead to step 12:
The number 21 fits into 110 5 times, leaving a remainder of 5.
The next digit of our result is 5. 
Result so far: 16091.238095
The remainder is 5 after subtracting 105 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 13:
The number 21 fits into 50 2 times, leaving a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 16091.2380952
Subtract 42 from 50 to get 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 14:
When dividing 80 by 21, we get 3 with a remainder of 17.
Record the quotient 3 as the next digit in the result. 
Result so far: 16091.23809523
Deduct 63 from 80 and we're left with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

The final result is 16091.23809523 with a remainder of 1.7e-08.