Let's divide 866599 by 12
Our goal is to divide 866599 by 12.

Advancing to step 1:
When dividing 8 by 12, we get 0 with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Take the next digit (6) from the dividend and append it to 8, then repeat: 86 / 12

Advancing to step 2:
If we divide 86 by 12, we get 7 and a remainder of 2.
Put 7 as the next digit of the answer. 
Result so far: 7.0
The remainder is 2 after subtracting 84 from 86.
Take the next digit (6) from the dividend and append it to 2, then repeat: 26 / 12

Let's proceed to step 3:
12 can be fit into 26 2 times, resulting in a remainder of 2.
Put 2 as the next digit of the answer. 
Result so far: 72.0
Subtract 24 from 26 to get 2.
Append the next digit (5) from the dividend to 2 and continue with: 25 / 12

Going ahead to step 4:
When dividing 25 by 12, we get 2 with a remainder of 1.
Record the quotient 2 as the next digit in the result. 
Result so far: 722.0
If we take 24 away from 25, we end up with 1.
Append the next digit (9) from the dividend to 1 and continue with: 19 / 12

Let's proceed to step 5:
When dividing 19 by 12, we get 1 with a remainder of 7.
Use 1 as the next digit of our solution. 
Result so far: 7221.0
Deduct 12 from 19 and we're left with 7.
Fetch the next digit (9) from the dividend, attach it to 7 and continue: 79 / 12

Moving on to step 6:
The number 12 fits into 79 6 times, leaving a remainder of 7.
The next digit of our result is 6. 
Result so far: 72216.0
The remainder is 7 after subtracting 72 from 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Going ahead to step 7:
The number 12 fits into 70 5 times, leaving a remainder of 10.
Put 5 as the next digit of the answer. 
Result so far: 72216.5
Deduct 60 from 70 and we're left 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.

Let's proceed to step 8:
If we divide 100 by 12, we get 8 and a remainder of 4.
Write down 8 as next digit of the result. 
Result so far: 72216.58
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.

Let's proceed to step 9:
If we divide 40 by 12, we get 3 and a remainder of 4.
Put 3 as the next digit of the answer. 
Result so far: 72216.583
Subtracting 36 from 40 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 10:
12 goes into 40 3 times with a remainder of 4.
Write down 3 as next digit of the result. 
Result so far: 72216.5833
Deduct 36 from 40 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

The quotient of the division is 72216.5833, and the remainder is 4e-05.