Let's divide 909612 by 21
Our goal is to divide 909612 by 21.

Going ahead to step 1:
The number 21 fits into 9 0 times, leaving a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Bring next digit (0) of the dividend behind the 9 and repeat the process: 90 / 21

Advancing to step 2:
When dividing 90 by 21, we get 4 with a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 4.0
Subtracting 84 from 90 leaves us with 6.
Append the next digit (9) from the dividend to 6 and continue with: 69 / 21

Going ahead to step 3:
21 goes into 69 3 times with a remainder of 6.
The number 3 becomes the next digit in our result. 
Result so far: 43.0
If we subtract 63 from 69, we get 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 21

Moving on to step 4:
If we divide 66 by 21, we get 3 and a remainder of 3.
The number 3 becomes the next digit in our result. 
Result so far: 433.0
If we subtract 63 from 66, we get 3.
Include the next digit (1) from the dividend after 3, then repeat: 31 / 21

Step 5:
21 can be fit into 31 1 times, resulting in a remainder of 10.
Record the quotient 1 as the next digit in the result. 
Result so far: 4331.0
Subtract 21 from 31 to get 10.
Append the next digit (2) from the dividend to 10 and continue with: 102 / 21

On to step 6:
The number 21 fits into 102 4 times, leaving a remainder of 18.
Record the quotient 4 as the next digit in the result. 
Result so far: 43314.0
Subtracting 84 from 102 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

On to step 7:
21 can be fit into 180 8 times, resulting in a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 43314.8
Subtracting 168 from 180 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 8:
If we divide 120 by 21, we get 5 and a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 43314.85
If we take 105 away from 120, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Let's proceed to step 9:
21 goes into 150 7 times with a remainder of 3.
The next digit of our result is 7. 
Result so far: 43314.857
If we subtract 147 from 150, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 10:
The number 21 fits into 30 1 times, leaving a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 43314.8571
If we take 21 away from 30, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 11:
90 divided by 21 is 4 with a remainder of 6.
The next digit of our result is 4. 
Result so far: 43314.85714
Subtract 84 from 90 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 12:
21 goes into 60 2 times with a remainder of 18.
The next digit of our result is 2. 
Result so far: 43314.857142
Subtracting 42 from 60 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Step 13:
The number 21 fits into 180 8 times, leaving a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 43314.8571428
Subtract 168 from 180 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 14:
120 divided by 21 is 5 with a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 43314.85714285
Subtracting 105 from 120 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

The final result is 43314.85714285 with a remainder of 1.5e-08.