We're dividing 612585 by 21 
We want to divide 612585 by 21.

Advancing to step 1:
6 divided by 21 is 0 with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Bring next digit (1) of the dividend behind the 6 and repeat the process: 61 / 21

Moving on to step 2:
21 goes into 61 2 times with a remainder of 19.
Put 2 as the next digit of the answer. 
Result so far: 2.0
The remainder is 19 after subtracting 42 from 61.
Append the next digit (2) from the dividend to 19 and continue with: 192 / 21

Going ahead to step 3:
21 can be fit into 192 9 times, resulting in a remainder of 3.
Use 9 as the next digit of our solution. 
Result so far: 29.0
Deduct 189 from 192 and we're left with 3.
Bring next digit (5) of the dividend behind the 3 and repeat the process: 35 / 21

Step 4:
35 divided by 21 is 1 with a remainder of 14.
Record the quotient 1 as the next digit in the result. 
Result so far: 291.0
The remainder is 14 after subtracting 21 from 35.
Take the next digit (8) from the dividend and append it to 14, then repeat: 148 / 21

On to step 5:
21 goes into 148 7 times with a remainder of 1.
Write down 7 as next digit of the result. 
Result so far: 2917.0
If we subtract 147 from 148, we get 1.
Take the next digit (5) from the dividend and append it to 1, then repeat: 15 / 21

Going ahead to step 6:
The number 21 fits into 15 0 times, leaving a remainder of 15.
The next digit of our result is 0. 
Result so far: 29170.0
If we take 0 away from 15, 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.

Step 7:
150 divided by 21 is 7 with a remainder of 3.
Use 7 as the next digit of our solution. 
Result so far: 29170.7
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.

Step 8:
When dividing 30 by 21, we get 1 with a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 29170.71
Subtract 21 from 30 to get 9.
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:
When dividing 90 by 21, we get 4 with a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 29170.714
Subtracting 84 from 90 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 10:
21 can be fit into 60 2 times, resulting in a remainder of 18.
Use 2 as the next digit of our solution. 
Result so far: 29170.7142
If we take 42 away from 60, we end up 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 11:
21 can be fit into 180 8 times, resulting in a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 29170.71428
The remainder is 12 after subtracting 168 from 180.
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 12:
If we divide 120 by 21, we get 5 and a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 29170.714285
Deduct 105 from 120 and we're left 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:
21 goes into 150 7 times with a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 29170.7142857
Subtract 147 from 150 to 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.

Moving on to step 14:
If we divide 30 by 21, we get 1 and a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 29170.71428571
Subtract 21 from 30 to get 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 29170.71428571 and a remainder of 9e-09.