428636 divided by 12 
Our goal is to divide 428636 by 12.

Going ahead to step 1:
The number 12 fits into 4 0 times, leaving a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Fetch the next digit (2) from the dividend, attach it to 4 and continue: 42 / 12

Advancing to step 2:
12 goes into 42 3 times with a remainder of 6.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Deduct 36 from 42 and we're left with 6.
Grab the next digit (8) from the dividend, add it to 6, then carry on: 68 / 12

Advancing to step 3:
The number 12 fits into 68 5 times, leaving a remainder of 8.
Record the quotient 5 as the next digit in the result. 
Result so far: 35.0
Deduct 60 from 68 and we're left with 8.
Fetch the next digit (6) from the dividend, attach it to 8 and continue: 86 / 12

On to step 4:
86 divided by 12 is 7 with a remainder of 2.
Put 7 as the next digit of the answer. 
Result so far: 357.0
Deduct 84 from 86 and we're left with 2.
Grab the next digit (3) from the dividend, add it to 2, then carry on: 23 / 12

Going ahead to step 5:
The number 12 fits into 23 1 times, leaving a remainder of 11.
The next digit of our result is 1. 
Result so far: 3571.0
If we take 12 away from 23, we end up with 11.
Bring next digit (6) of the dividend behind the 11 and repeat the process: 116 / 12

Moving on to step 6:
When dividing 116 by 12, we get 9 with a remainder of 8.
Write down 9 as next digit of the result. 
Result so far: 35719.0
Subtracting 108 from 116 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 7:
80 divided by 12 is 6 with a remainder of 8.
The next digit of our result is 6. 
Result so far: 35719.6
Subtract 72 from 80 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 8:
If we divide 80 by 12, we get 6 and a remainder of 8.
Write down 6 as next digit of the result. 
Result so far: 35719.66
If we subtract 72 from 80, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

After the division, we end up with 35719.66 and a remainder of 0.008.