Let's divide 612504 by 21
We're looking to find how many times 21 goes into 612504.

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

On to step 2:
The number 21 fits into 61 2 times, leaving a remainder of 19.
The next digit of our result is 2. 
Result so far: 2.0
The remainder is 19 after subtracting 42 from 61.
Fetch the next digit (2) from the dividend, attach it to 19 and continue: 192 / 21

Moving on to step 3:
The number 21 fits into 192 9 times, leaving 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.
Include the next digit (5) from the dividend after 3, then repeat: 35 / 21

Going ahead to step 4:
35 divided by 21 is 1 with a remainder of 14.
Write down 1 as next digit of the result. 
Result so far: 291.0
Deduct 21 from 35 and we're left with 14.
Grab the next digit (0) from the dividend, add it to 14, then carry on: 140 / 21

Going ahead to step 5:
21 can be fit into 140 6 times, resulting in a remainder of 14.
The number 6 becomes the next digit in our result. 
Result so far: 2916.0
If we take 126 away from 140, we end up with 14.
Take the next digit (4) from the dividend and append it to 14, then repeat: 144 / 21

Moving on to step 6:
When dividing 144 by 21, we get 6 with a remainder of 18.
Use 6 as the next digit of our solution. 
Result so far: 29166.0
Deduct 126 from 144 and we're left 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.

Advancing to step 7:
When dividing 180 by 21, we get 8 with a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 29166.8
Deduct 168 from 180 and we're left 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.

Going ahead to step 8:
The number 21 fits into 120 5 times, leaving a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 29166.85
Subtract 105 from 120 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.

Going ahead to step 9:
21 goes into 150 7 times with a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 29166.857
If we take 147 away from 150, we end up 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 10:
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: 29166.8571
Deduct 21 from 30 and we're left 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.

Advancing to step 11:
21 goes into 90 4 times with a remainder of 6.
The next digit of our result is 4. 
Result so far: 29166.85714
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.

Let's proceed to step 12:
60 divided by 21 is 2 with a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 29166.857142
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.

Moving on to step 13:
21 goes into 180 8 times with a remainder of 12.
The next digit of our result is 8. 
Result so far: 29166.8571428
If we subtract 168 from 180, we 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.

Step 14:
21 can be fit into 120 5 times, resulting in a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 29166.85714285
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.

Our division results in 29166.85714285 with a remaining 1.5e-08.