861615 divided by 66 
Let's see how many times 66 fits into 861615.

Advancing to step 1:
When dividing 8 by 66, we get 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 (6) from the dividend, add it to 8, then carry on: 86 / 66

Step 2:
The number 66 fits into 86 1 times, leaving a remainder of 20.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Deduct 66 from 86 and we're left with 20.
Include the next digit (1) from the dividend after 20, then repeat: 201 / 66

Step 3:
When dividing 201 by 66, we get 3 with a remainder of 3.
Put 3 as the next digit of the answer. 
Result so far: 13.0
If we take 198 away from 201, we end up with 3.
Grab the next digit (6) from the dividend, add it to 3, then carry on: 36 / 66

On to step 4:
66 can be fit into 36 0 times, resulting in a remainder of 36.
The next digit of our result is 0. 
Result so far: 130.0
Subtracting 0 from 36 leaves us with 36.
Fetch the next digit (1) from the dividend, attach it to 36 and continue: 361 / 66

On to step 5:
66 goes into 361 5 times with a remainder of 31.
The number 5 becomes the next digit in our result. 
Result so far: 1305.0
If we take 330 away from 361, we end up with 31.
Take the next digit (5) from the dividend and append it to 31, then repeat: 315 / 66

Going ahead to step 6:
315 divided by 66 is 4 with a remainder of 51.
Put 4 as the next digit of the answer. 
Result so far: 13054.0
Subtract 264 from 315 to get 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Going ahead to step 7:
When dividing 510 by 66, we get 7 with a remainder of 48.
The next digit of our result is 7. 
Result so far: 13054.7
Subtract 462 from 510 to get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Step 8:
480 divided by 66 is 7 with a remainder of 18.
Record the quotient 7 as the next digit in the result. 
Result so far: 13054.77
If we take 462 away from 480, we end up with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Our division results in 13054.77 with a remaining 0.018.