We look at the division of 857646 by 66 
Our goal is to divide 857646 by 66.

On to step 1:
8 divided by 66 is 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Grab the next digit (5) from the dividend, add it to 8, then carry on: 85 / 66

Going ahead to step 2:
The number 66 fits into 85 1 times, leaving a remainder of 19.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
The remainder is 19 after subtracting 66 from 85.
Include the next digit (7) from the dividend after 19, then repeat: 197 / 66

On to step 3:
The number 66 fits into 197 2 times, leaving a remainder of 65.
Put 2 as the next digit of the answer. 
Result so far: 12.0
Subtracting 132 from 197 leaves us with 65.
Append the next digit (6) from the dividend to 65 and continue with: 656 / 66

On to step 4:
66 can be fit into 656 9 times, resulting in a remainder of 62.
The next digit of our result is 9. 
Result so far: 129.0
Subtract 594 from 656 to get 62.
Take the next digit (4) from the dividend and append it to 62, then repeat: 624 / 66

On to step 5:
When dividing 624 by 66, we get 9 with a remainder of 30.
Use 9 as the next digit of our solution. 
Result so far: 1299.0
Deduct 594 from 624 and we're left with 30.
Append the next digit (6) from the dividend to 30 and continue with: 306 / 66

Step 6:
66 goes into 306 4 times with a remainder of 42.
Record the quotient 4 as the next digit in the result. 
Result so far: 12994.0
Subtract 264 from 306 to get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Advancing to step 7:
66 goes into 420 6 times with a remainder of 24.
Use 6 as the next digit of our solution. 
Result so far: 12994.6
If we take 396 away from 420, we end up with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Moving on to step 8:
If we divide 240 by 66, we get 3 and a remainder of 42.
Write down 3 as next digit of the result. 
Result so far: 12994.63
If we take 198 away from 240, we end up with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Step 9:
66 goes into 420 6 times with a remainder of 24.
Put 6 as the next digit of the answer. 
Result so far: 12994.636
If we take 396 away from 420, we end up with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Going ahead to step 10:
240 divided by 66 is 3 with a remainder of 42.
Record the quotient 3 as the next digit in the result. 
Result so far: 12994.6363
Subtract 198 from 240 to get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Step 11:
66 goes into 420 6 times with a remainder of 24.
Use 6 as the next digit of our solution. 
Result so far: 12994.63636
If we take 396 away from 420, we end up with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Step 12:
66 goes into 240 3 times with a remainder of 42.
The next digit of our result is 3. 
Result so far: 12994.636363
Subtract 198 from 240 to get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Advancing to step 13:
When dividing 420 by 66, we get 6 with a remainder of 24.
Record the quotient 6 as the next digit in the result. 
Result so far: 12994.6363636
If we take 396 away from 420, we end up with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Going ahead to step 14:
When dividing 240 by 66, we get 3 with a remainder of 42.
Use 3 as the next digit of our solution. 
Result so far: 12994.63636363
The remainder is 42 after subtracting 198 from 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

The final outcome is 12994.63636363, with a leftover of 4.2e-08.