We're dividing 861634 by 12 
Let's see how many times 12 fits into 861634.

Step 1:
If we divide 8 by 12, we get 0 and a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Bring next digit (6) of the dividend behind the 8 and repeat the process: 86 / 12

Let's proceed to step 2:
The number 12 fits into 86 7 times, leaving a remainder of 2.
The next digit of our result is 7. 
Result so far: 7.0
Deduct 84 from 86 and we're left with 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 12

On to step 3:
21 divided by 12 is 1 with a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 71.0
The remainder is 9 after subtracting 12 from 21.
Grab the next digit (6) from the dividend, add it to 9, then carry on: 96 / 12

On to step 4:
If we divide 96 by 12, we get 8 and a remainder of 0.
The number 8 becomes the next digit in our result. 
Result so far: 718.0
Subtract 96 from 96 to get 0.
Bring next digit (3) of the dividend behind the 0 and repeat the process: 3 / 12

Going ahead to step 5:
12 goes into 3 0 times with a remainder of 3.
The next digit of our result is 0. 
Result so far: 7180.0
Subtract 0 from 3 to get 3.
Take the next digit (4) from the dividend and append it to 3, then repeat: 34 / 12

On to step 6:
When dividing 34 by 12, we get 2 with a remainder of 10.
Write down 2 as next digit of the result. 
Result so far: 71802.0
If we subtract 24 from 34, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 7:
12 goes into 100 8 times with a remainder of 4.
Use 8 as the next digit of our solution. 
Result so far: 71802.8
Subtracting 96 from 100 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.

Advancing to step 8:
12 can be fit into 40 3 times, resulting in a remainder of 4.
Record the quotient 3 as the next digit in the result. 
Result so far: 71802.83
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.

On to step 9:
When dividing 40 by 12, we get 3 with a remainder of 4.
Use 3 as the next digit of our solution. 
Result so far: 71802.833
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.

The quotient of the division is 71802.833, and the remainder is 0.0004.