Let's divide 124812 by 21
We want to divide 124812 by 21.

Let's proceed to step 1:
1 divided by 21 is 0 with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Grab the next digit (2) from the dividend, add it to 1, then carry on: 12 / 21

Let's proceed to step 2:
If we divide 12 by 21, we get 0 and a remainder of 12.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 12 and we're left with 12.
Append the next digit (4) from the dividend to 12 and continue with: 124 / 21

Going ahead to step 3:
When dividing 124 by 21, we get 5 with a remainder of 19.
The next digit of our result is 5. 
Result so far: 5.0
If we take 105 away from 124, we end up with 19.
Take the next digit (8) from the dividend and append it to 19, then repeat: 198 / 21

On to step 4:
The number 21 fits into 198 9 times, leaving a remainder of 9.
Use 9 as the next digit of our solution. 
Result so far: 59.0
The remainder is 9 after subtracting 189 from 198.
Append the next digit (1) from the dividend to 9 and continue with: 91 / 21

Step 5:
If we divide 91 by 21, we get 4 and a remainder of 7.
The next digit of our result is 4. 
Result so far: 594.0
Subtract 84 from 91 to get 7.
Fetch the next digit (2) from the dividend, attach it to 7 and continue: 72 / 21

Moving on to step 6:
21 goes into 72 3 times with a remainder of 9.
The number 3 becomes the next digit in our result. 
Result so far: 5943.0
The remainder is 9 after subtracting 63 from 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 7:
If we divide 90 by 21, we get 4 and a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 5943.4
The remainder is 6 after subtracting 84 from 90.
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 8:
60 divided by 21 is 2 with a remainder of 18.
Put 2 as the next digit of the answer. 
Result so far: 5943.42
Deduct 42 from 60 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.

Step 9:
If we divide 180 by 21, we get 8 and a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 5943.428
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.

On to step 10:
21 goes into 120 5 times with a remainder of 15.
The next digit of our result is 5. 
Result so far: 5943.4285
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.

Moving on to step 11:
When dividing 150 by 21, we get 7 with a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 5943.42857
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.

On to step 12:
21 can be fit into 30 1 times, resulting in a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 5943.428571
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.

Moving on to step 13:
21 can be fit into 90 4 times, resulting in a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 5943.4285714
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.

Let's proceed to step 14:
21 can be fit into 60 2 times, resulting in a remainder of 18.
The next digit of our result is 2. 
Result so far: 5943.42857142
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.

The final result is 5943.42857142 with a remainder of 1.8e-08.