We look at the division of 12166024 by 810 
We want to divide 12166024 by 810.

On to step 1:
The number 810 fits into 1 0 times, leaving a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Take the next digit (2) from the dividend and append it to 1, then repeat: 12 / 810

Step 2:
If we divide 12 by 810, we get 0 and a remainder of 12.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 12 after subtracting 0 from 12.
Append the next digit (1) from the dividend to 12 and continue with: 121 / 810

Moving on to step 3:
When dividing 121 by 810, we get 0 with a remainder of 121.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 121 to get 121.
Append the next digit (6) from the dividend to 121 and continue with: 1216 / 810

Moving on to step 4:
If we divide 1216 by 810, we get 1 and a remainder of 406.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 810 from 1216 leaves us with 406.
Take the next digit (6) from the dividend and append it to 406, then repeat: 4066 / 810

Moving on to step 5:
The number 810 fits into 4066 5 times, leaving a remainder of 16.
The number 5 becomes the next digit in our result. 
Result so far: 15.0
If we take 4050 away from 4066, we end up with 16.
Bring next digit (0) of the dividend behind the 16 and repeat the process: 160 / 810

Moving on to step 6:
810 can be fit into 160 0 times, resulting in a remainder of 160.
Record the quotient 0 as the next digit in the result. 
Result so far: 150.0
The remainder is 160 after subtracting 0 from 160.
Grab the next digit (2) from the dividend, add it to 160, then carry on: 1602 / 810

Step 7:
1602 divided by 810 is 1 with a remainder of 792.
The number 1 becomes the next digit in our result. 
Result so far: 1501.0
If we take 810 away from 1602, we end up with 792.
Fetch the next digit (4) from the dividend, attach it to 792 and continue: 7924 / 810

Step 8:
The number 810 fits into 7924 9 times, leaving a remainder of 634.
The next digit of our result is 9. 
Result so far: 15019.0
Subtracting 7290 from 7924 leaves us with 634.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6340, and continue the process.

Advancing to step 9:
If we divide 6340 by 810, we get 7 and a remainder of 670.
Record the quotient 7 as the next digit in the result. 
Result so far: 15019.7
Subtracting 5670 from 6340 leaves us with 670.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6700, and continue the process.

Moving on to step 10:
810 can be fit into 6700 8 times, resulting in a remainder of 220.
Record the quotient 8 as the next digit in the result. 
Result so far: 15019.78
Deduct 6480 from 6700 and we're left with 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

Step 11:
The number 810 fits into 2200 2 times, leaving a remainder of 580.
Write down 2 as next digit of the result. 
Result so far: 15019.782
Deduct 1620 from 2200 and we're left with 580.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5800, and continue the process.

Let's proceed to step 12:
If we divide 5800 by 810, we get 7 and a remainder of 130.
Write down 7 as next digit of the result. 
Result so far: 15019.7827
The remainder is 130 after subtracting 5670 from 5800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

Step 13:
When dividing 1300 by 810, we get 1 with a remainder of 490.
Record the quotient 1 as the next digit in the result. 
Result so far: 15019.78271
Subtract 810 from 1300 to get 490.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4900, and continue the process.

Advancing to step 14:
If we divide 4900 by 810, we get 6 and a remainder of 40.
Record the quotient 6 as the next digit in the result. 
Result so far: 15019.782716
If we subtract 4860 from 4900, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Step 15:
If we divide 400 by 810, we get 0 and a remainder of 400.
The next digit of our result is 0. 
Result so far: 15019.782716
Deduct 0 from 400 and we're left with 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Moving on to step 16:
810 can be fit into 4000 4 times, resulting in a remainder of 760.
The number 4 becomes the next digit in our result. 
Result so far: 15019.78271604
If we take 3240 away from 4000, we end up with 760.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7600, and continue the process.

After the division, we end up with 15019.78271604 and a remainder of 7.6e-07.