906039 divided by 21 
We want to divide 906039 by 21.

Let's proceed to step 1:
9 divided by 21 is 0 with 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.
Append the next digit (0) from the dividend to 9 and continue with: 90 / 21

Moving on to step 2:
If we divide 90 by 21, we get 4 and a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 4.0
The remainder is 6 after subtracting 84 from 90.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 21

Let's proceed to step 3:
21 goes into 66 3 times with a remainder of 3.
Record the quotient 3 as the next digit in the result. 
Result so far: 43.0
Subtracting 63 from 66 leaves us with 3.
Fetch the next digit (0) from the dividend, attach it to 3 and continue: 30 / 21

On to step 4:
The number 21 fits into 30 1 times, leaving a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 431.0
If we subtract 21 from 30, we get 9.
Fetch the next digit (3) from the dividend, attach it to 9 and continue: 93 / 21

Let's proceed to step 5:
If we divide 93 by 21, we get 4 and a remainder of 9.
Put 4 as the next digit of the answer. 
Result so far: 4314.0
Subtract 84 from 93 to get 9.
Grab the next digit (9) from the dividend, add it to 9, then carry on: 99 / 21

Step 6:
When dividing 99 by 21, we get 4 with a remainder of 15.
Use 4 as the next digit of our solution. 
Result so far: 43144.0
Subtract 84 from 99 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 7:
21 can be fit into 150 7 times, resulting in a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 43144.7
Subtracting 147 from 150 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 8:
30 divided by 21 is 1 with a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 43144.71
The remainder is 9 after subtracting 21 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 9:
The number 21 fits into 90 4 times, leaving a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 43144.714
If we subtract 84 from 90, we 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.

Step 10:
The number 21 fits into 60 2 times, leaving a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 43144.7142
Subtract 42 from 60 to get 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 11:
180 divided by 21 is 8 with a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 43144.71428
If we take 168 away from 180, we end up 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.

Step 12:
21 goes into 120 5 times with a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 43144.714285
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 13:
The number 21 fits into 150 7 times, leaving a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 43144.7142857
Deduct 147 from 150 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 14:
30 divided by 21 is 1 with a remainder of 9.
The next digit of our result is 1. 
Result so far: 43144.71428571
Subtracting 21 from 30 leaves us 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.

After the division, we end up with 43144.71428571 and a remainder of 9e-09.