We look at the division of 21030890 by 851 
We're looking to find how many times 851 goes into 21030890.

Let's proceed to step 1:
If we divide 2 by 851, we get 0 and a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Take the next digit (1) from the dividend and append it to 2, then repeat: 21 / 851

Advancing to step 2:
When dividing 21 by 851, we get 0 with a remainder of 21.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 21 after subtracting 0 from 21.
Take the next digit (0) from the dividend and append it to 21, then repeat: 210 / 851

Let's proceed to step 3:
210 divided by 851 is 0 with a remainder of 210.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 210 and we're left with 210.
Grab the next digit (3) from the dividend, add it to 210, then carry on: 2103 / 851

Advancing to step 4:
851 can be fit into 2103 2 times, resulting in a remainder of 401.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we subtract 1702 from 2103, we get 401.
Take the next digit (0) from the dividend and append it to 401, then repeat: 4010 / 851

On to step 5:
851 can be fit into 4010 4 times, resulting in a remainder of 606.
Put 4 as the next digit of the answer. 
Result so far: 24.0
Subtract 3404 from 4010 to get 606.
Bring next digit (8) of the dividend behind the 606 and repeat the process: 6068 / 851

On to step 6:
851 goes into 6068 7 times with a remainder of 111.
The next digit of our result is 7. 
Result so far: 247.0
Subtracting 5957 from 6068 leaves us with 111.
Include the next digit (9) from the dividend after 111, then repeat: 1119 / 851

On to step 7:
When dividing 1119 by 851, we get 1 with a remainder of 268.
Write down 1 as next digit of the result. 
Result so far: 2471.0
Subtract 851 from 1119 to get 268.
Take the next digit (0) from the dividend and append it to 268, then repeat: 2680 / 851

Step 8:
851 goes into 2680 3 times with a remainder of 127.
The next digit of our result is 3. 
Result so far: 24713.0
The remainder is 127 after subtracting 2553 from 2680.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1270, and continue the process.

Let's proceed to step 9:
851 goes into 1270 1 times with a remainder of 419.
The next digit of our result is 1. 
Result so far: 24713.1
Deduct 851 from 1270 and we're left with 419.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4190, and continue the process.

Let's proceed to step 10:
If we divide 4190 by 851, we get 4 and a remainder of 786.
The next digit of our result is 4. 
Result so far: 24713.14
If we subtract 3404 from 4190, we get 786.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7860, and continue the process.

Moving on to step 11:
If we divide 7860 by 851, we get 9 and a remainder of 201.
The next digit of our result is 9. 
Result so far: 24713.149
Deduct 7659 from 7860 and we're left with 201.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2010, and continue the process.

Advancing to step 12:
2010 divided by 851 is 2 with a remainder of 308.
Write down 2 as next digit of the result. 
Result so far: 24713.1492
If we take 1702 away from 2010, we end up with 308.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3080, and continue the process.

Going ahead to step 13:
851 goes into 3080 3 times with a remainder of 527.
The number 3 becomes the next digit in our result. 
Result so far: 24713.14923
The remainder is 527 after subtracting 2553 from 3080.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5270, and continue the process.

On to step 14:
851 can be fit into 5270 6 times, resulting in a remainder of 164.
Use 6 as the next digit of our solution. 
Result so far: 24713.149236
The remainder is 164 after subtracting 5106 from 5270.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1640, and continue the process.

Advancing to step 15:
851 can be fit into 1640 1 times, resulting in a remainder of 789.
Use 1 as the next digit of our solution. 
Result so far: 24713.1492361
If we subtract 851 from 1640, we get 789.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7890, and continue the process.

Going ahead to step 16:
851 goes into 7890 9 times with a remainder of 231.
Use 9 as the next digit of our solution. 
Result so far: 24713.14923619
If we subtract 7659 from 7890, we get 231.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2310, and continue the process.

Our division results in 24713.14923619 with a remaining 2.31e-07.