851581 divided by 12 
We're looking to find how many times 12 goes into 851581.

Let's proceed to step 1:
When dividing 8 by 12, we get 0 with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Include the next digit (5) from the dividend after 8, then repeat: 85 / 12

Going ahead to step 2:
If we divide 85 by 12, we get 7 and a remainder of 1.
Put 7 as the next digit of the answer. 
Result so far: 7.0
Subtracting 84 from 85 leaves us with 1.
Append the next digit (1) from the dividend to 1 and continue with: 11 / 12

On to step 3:
12 goes into 11 0 times with a remainder of 11.
The next digit of our result is 0. 
Result so far: 70.0
Subtracting 0 from 11 leaves us with 11.
Append the next digit (5) from the dividend to 11 and continue with: 115 / 12

Let's proceed to step 4:
12 goes into 115 9 times with a remainder of 7.
Record the quotient 9 as the next digit in the result. 
Result so far: 709.0
Subtracting 108 from 115 leaves us with 7.
Include the next digit (8) from the dividend after 7, then repeat: 78 / 12

Moving on to step 5:
78 divided by 12 is 6 with a remainder of 6.
Put 6 as the next digit of the answer. 
Result so far: 7096.0
Subtract 72 from 78 to get 6.
Grab the next digit (1) from the dividend, add it to 6, then carry on: 61 / 12

On to step 6:
When dividing 61 by 12, we get 5 with a remainder of 1.
Use 5 as the next digit of our solution. 
Result so far: 70965.0
The remainder is 1 after subtracting 60 from 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Moving on to step 7:
12 can be fit into 10 0 times, resulting in a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 70965.0
Subtracting 0 from 10 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 8:
12 goes into 100 8 times with a remainder of 4.
The number 8 becomes the next digit in our result. 
Result so far: 70965.08
The remainder is 4 after subtracting 96 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 9:
If we divide 40 by 12, we get 3 and a remainder of 4.
Record the quotient 3 as the next digit in the result. 
Result so far: 70965.083
If we subtract 36 from 40, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 10:
12 goes into 40 3 times with a remainder of 4.
The number 3 becomes the next digit in our result. 
Result so far: 70965.0833
Subtract 36 from 40 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Our division results in 70965.0833 with a remaining 4e-05.