We look at the division of 66088103 by 864 
Let's see how many times 864 fits into 66088103.

Advancing to step 1:
If we divide 6 by 864, we get 0 and a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 864

Advancing to step 2:
If we divide 66 by 864, we get 0 and a remainder of 66.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 66, we end up with 66.
Include the next digit (0) from the dividend after 66, then repeat: 660 / 864

Advancing to step 3:
864 goes into 660 0 times with a remainder of 660.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 660 leaves us with 660.
Grab the next digit (8) from the dividend, add it to 660, then carry on: 6608 / 864

Going ahead to step 4:
If we divide 6608 by 864, we get 7 and a remainder of 560.
Put 7 as the next digit of the answer. 
Result so far: 7.0
If we subtract 6048 from 6608, we get 560.
Take the next digit (8) from the dividend and append it to 560, then repeat: 5608 / 864

Advancing to step 5:
If we divide 5608 by 864, we get 6 and a remainder of 424.
Record the quotient 6 as the next digit in the result. 
Result so far: 76.0
The remainder is 424 after subtracting 5184 from 5608.
Append the next digit (1) from the dividend to 424 and continue with: 4241 / 864

Moving on to step 6:
864 goes into 4241 4 times with a remainder of 785.
The number 4 becomes the next digit in our result. 
Result so far: 764.0
Subtracting 3456 from 4241 leaves us with 785.
Take the next digit (0) from the dividend and append it to 785, then repeat: 7850 / 864

On to step 7:
The number 864 fits into 7850 9 times, leaving a remainder of 74.
Put 9 as the next digit of the answer. 
Result so far: 7649.0
Subtracting 7776 from 7850 leaves us with 74.
Fetch the next digit (3) from the dividend, attach it to 74 and continue: 743 / 864

Moving on to step 8:
743 divided by 864 is 0 with a remainder of 743.
The number 0 becomes the next digit in our result. 
Result so far: 76490.0
The remainder is 743 after subtracting 0 from 743.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7430, and continue the process.

Let's proceed to step 9:
When dividing 7430 by 864, we get 8 with a remainder of 518.
Record the quotient 8 as the next digit in the result. 
Result so far: 76490.8
The remainder is 518 after subtracting 6912 from 7430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5180, and continue the process.

Let's proceed to step 10:
The number 864 fits into 5180 5 times, leaving a remainder of 860.
Write down 5 as next digit of the result. 
Result so far: 76490.85
If we subtract 4320 from 5180, we get 860.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8600, and continue the process.

Going ahead to step 11:
864 can be fit into 8600 9 times, resulting in a remainder of 824.
The number 9 becomes the next digit in our result. 
Result so far: 76490.859
If we subtract 7776 from 8600, we get 824.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8240, and continue the process.

Going ahead to step 12:
8240 divided by 864 is 9 with a remainder of 464.
The number 9 becomes the next digit in our result. 
Result so far: 76490.8599
The remainder is 464 after subtracting 7776 from 8240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4640, and continue the process.

Our division results in 76490.8599 with a remaining 0.00464.