86866304 ÷ 645 
We want to figure out the number of times 86866304 can be divided by 645.

Going ahead to step 1:
The number 645 fits into 8 0 times, leaving a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Fetch the next digit (6) from the dividend, attach it to 8 and continue: 86 / 645

Going ahead to step 2:
86 divided by 645 is 0 with a remainder of 86.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 86, we end up with 86.
Take the next digit (8) from the dividend and append it to 86, then repeat: 868 / 645

Moving on to step 3:
When dividing 868 by 645, we get 1 with a remainder of 223.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we take 645 away from 868, we end up with 223.
Fetch the next digit (6) from the dividend, attach it to 223 and continue: 2236 / 645

On to step 4:
If we divide 2236 by 645, we get 3 and a remainder of 301.
Write down 3 as next digit of the result. 
Result so far: 13.0
If we subtract 1935 from 2236, we get 301.
Include the next digit (6) from the dividend after 301, then repeat: 3016 / 645

Moving on to step 5:
When dividing 3016 by 645, we get 4 with a remainder of 436.
Record the quotient 4 as the next digit in the result. 
Result so far: 134.0
Subtract 2580 from 3016 to get 436.
Include the next digit (3) from the dividend after 436, then repeat: 4363 / 645

Let's proceed to step 6:
When dividing 4363 by 645, we get 6 with a remainder of 493.
The number 6 becomes the next digit in our result. 
Result so far: 1346.0
Subtract 3870 from 4363 to get 493.
Grab the next digit (0) from the dividend, add it to 493, then carry on: 4930 / 645

On to step 7:
When dividing 4930 by 645, we get 7 with a remainder of 415.
Record the quotient 7 as the next digit in the result. 
Result so far: 13467.0
Subtract 4515 from 4930 to get 415.
Grab the next digit (4) from the dividend, add it to 415, then carry on: 4154 / 645

Moving on to step 8:
If we divide 4154 by 645, we get 6 and a remainder of 284.
The next digit of our result is 6. 
Result so far: 134676.0
If we take 3870 away from 4154, we end up with 284.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2840, and continue the process.

Going ahead to step 9:
645 goes into 2840 4 times with a remainder of 260.
Use 4 as the next digit of our solution. 
Result so far: 134676.4
The remainder is 260 after subtracting 2580 from 2840.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

On to step 10:
When dividing 2600 by 645, we get 4 with a remainder of 20.
The number 4 becomes the next digit in our result. 
Result so far: 134676.44
If we subtract 2580 from 2600, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

The quotient of the division is 134676.44, and the remainder is 0.02.