We divide 12159860 by 810
We're looking to find how many times 810 goes into 12159860.

Advancing to step 1:
If we divide 1 by 810, we get 0 and a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Append the next digit (2) from the dividend to 1 and continue with: 12 / 810

Going ahead to step 2:
810 can be fit into 12 0 times, resulting in a remainder of 12.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 12, we get 12.
Bring next digit (1) of the dividend behind the 12 and repeat the process: 121 / 810

Moving on to step 3:
810 can be fit into 121 0 times, resulting in a remainder of 121.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 121 after subtracting 0 from 121.
Append the next digit (5) from the dividend to 121 and continue with: 1215 / 810

Going ahead to step 4:
The number 810 fits into 1215 1 times, leaving a remainder of 405.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtracting 810 from 1215 leaves us with 405.
Bring next digit (9) of the dividend behind the 405 and repeat the process: 4059 / 810

On to step 5:
810 goes into 4059 5 times with a remainder of 9.
Record the quotient 5 as the next digit in the result. 
Result so far: 15.0
If we subtract 4050 from 4059, we get 9.
Take the next digit (8) from the dividend and append it to 9, then repeat: 98 / 810

Let's proceed to step 6:
If we divide 98 by 810, we get 0 and a remainder of 98.
Put 0 as the next digit of the answer. 
Result so far: 150.0
If we subtract 0 from 98, we get 98.
Bring next digit (6) of the dividend behind the 98 and repeat the process: 986 / 810

Advancing to step 7:
810 can be fit into 986 1 times, resulting in a remainder of 176.
Write down 1 as next digit of the result. 
Result so far: 1501.0
If we subtract 810 from 986, we get 176.
Grab the next digit (0) from the dividend, add it to 176, then carry on: 1760 / 810

Step 8:
When dividing 1760 by 810, we get 2 with a remainder of 140.
Record the quotient 2 as the next digit in the result. 
Result so far: 15012.0
If we take 1620 away from 1760, we end up with 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Advancing to step 9:
810 can be fit into 1400 1 times, resulting in a remainder of 590.
The number 1 becomes the next digit in our result. 
Result so far: 15012.1
If we take 810 away from 1400, we end up with 590.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5900, and continue the process.

On to step 10:
5900 divided by 810 is 7 with a remainder of 230.
The number 7 becomes the next digit in our result. 
Result so far: 15012.17
If we take 5670 away from 5900, we end up with 230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2300, and continue the process.

Going ahead to step 11:
810 can be fit into 2300 2 times, resulting in a remainder of 680.
Record the quotient 2 as the next digit in the result. 
Result so far: 15012.172
Deduct 1620 from 2300 and we're left with 680.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6800, and continue the process.

Let's proceed to step 12:
If we divide 6800 by 810, we get 8 and a remainder of 320.
The next digit of our result is 8. 
Result so far: 15012.1728
If we take 6480 away from 6800, we end up with 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

Step 13:
The number 810 fits into 3200 3 times, leaving a remainder of 770.
Record the quotient 3 as the next digit in the result. 
Result so far: 15012.17283
If we take 2430 away from 3200, we end up with 770.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7700, and continue the process.

Going ahead to step 14:
810 goes into 7700 9 times with a remainder of 410.
The number 9 becomes the next digit in our result. 
Result so far: 15012.172839
Deduct 7290 from 7700 and we're left with 410.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4100, and continue the process.

On to step 15:
810 goes into 4100 5 times with a remainder of 50.
Put 5 as the next digit of the answer. 
Result so far: 15012.1728395
Subtracting 4050 from 4100 leaves us with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Advancing to step 16:
810 goes into 500 0 times with a remainder of 500.
Write down 0 as next digit of the result. 
Result so far: 15012.1728395
If we subtract 0 from 500, we get 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5000, and continue the process.

In conclusion, the division gives 15012.1728395 with a balance of 5e-07.