We look at the division of 869886 by 12 
We're looking to find how many times 12 goes into 869886.

Step 1:
12 goes into 8 0 times with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Bring next digit (6) of the dividend behind the 8 and repeat the process: 86 / 12

Going ahead to step 2:
If we divide 86 by 12, we get 7 and a remainder of 2.
Write down 7 as next digit of the result. 
Result so far: 7.0
Subtracting 84 from 86 leaves us with 2.
Append the next digit (9) from the dividend to 2 and continue with: 29 / 12

Advancing to step 3:
If we divide 29 by 12, we get 2 and a remainder of 5.
Write down 2 as next digit of the result. 
Result so far: 72.0
Subtract 24 from 29 to get 5.
Grab the next digit (8) from the dividend, add it to 5, then carry on: 58 / 12

Going ahead to step 4:
If we divide 58 by 12, we get 4 and a remainder of 10.
The number 4 becomes the next digit in our result. 
Result so far: 724.0
Deduct 48 from 58 and we're left with 10.
Grab the next digit (8) from the dividend, add it to 10, then carry on: 108 / 12

Step 5:
12 can be fit into 108 9 times, resulting in a remainder of 0.
Put 9 as the next digit of the answer. 
Result so far: 7249.0
Deduct 108 from 108 and we're left with 0.
Take the next digit (6) from the dividend and append it to 0, then repeat: 6 / 12

Going ahead to step 6:
12 can be fit into 6 0 times, resulting in a remainder of 6.
The next digit of our result is 0. 
Result so far: 72490.0
Deduct 0 from 6 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 7:
12 goes into 60 5 times with a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 72490.5
If we subtract 60 from 60, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 8:
When dividing 0 by 12, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 72490.5
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 9:
0 divided by 12 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 72490.5
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 72490.5 with a remaining 0.0.