We're dividing 86355231 by 990 
We're looking to find how many times 990 goes into 86355231.

Moving on to step 1:
The number 990 fits into 8 0 times, leaving a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Bring next digit (6) of the dividend behind the 8 and repeat the process: 86 / 990

On to step 2:
990 goes into 86 0 times with a remainder of 86.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 86 and we're left with 86.
Bring next digit (3) of the dividend behind the 86 and repeat the process: 863 / 990

Moving on to step 3:
When dividing 863 by 990, we get 0 with a remainder of 863.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 863 after subtracting 0 from 863.
Take the next digit (5) from the dividend and append it to 863, then repeat: 8635 / 990

Step 4:
The number 990 fits into 8635 8 times, leaving a remainder of 715.
Use 8 as the next digit of our solution. 
Result so far: 8.0
If we take 7920 away from 8635, we end up with 715.
Take the next digit (5) from the dividend and append it to 715, then repeat: 7155 / 990

Moving on to step 5:
When dividing 7155 by 990, we get 7 with a remainder of 225.
Use 7 as the next digit of our solution. 
Result so far: 87.0
If we take 6930 away from 7155, we end up with 225.
Bring next digit (2) of the dividend behind the 225 and repeat the process: 2252 / 990

Moving on to step 6:
If we divide 2252 by 990, we get 2 and a remainder of 272.
Write down 2 as next digit of the result. 
Result so far: 872.0
Subtract 1980 from 2252 to get 272.
Include the next digit (3) from the dividend after 272, then repeat: 2723 / 990

Moving on to step 7:
The number 990 fits into 2723 2 times, leaving a remainder of 743.
Use 2 as the next digit of our solution. 
Result so far: 8722.0
If we take 1980 away from 2723, we end up with 743.
Include the next digit (1) from the dividend after 743, then repeat: 7431 / 990

Step 8:
990 goes into 7431 7 times with a remainder of 501.
Record the quotient 7 as the next digit in the result. 
Result so far: 87227.0
Deduct 6930 from 7431 and we're left with 501.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5010, and continue the process.

Step 9:
If we divide 5010 by 990, we get 5 and a remainder of 60.
Put 5 as the next digit of the answer. 
Result so far: 87227.5
Subtracting 4950 from 5010 leaves us with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Step 10:
600 divided by 990 is 0 with a remainder of 600.
Record the quotient 0 as the next digit in the result. 
Result so far: 87227.5
Subtracting 0 from 600 leaves us with 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6000, and continue the process.

Advancing to step 11:
990 goes into 6000 6 times with a remainder of 60.
Record the quotient 6 as the next digit in the result. 
Result so far: 87227.506
The remainder is 60 after subtracting 5940 from 6000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Advancing to step 12:
The number 990 fits into 600 0 times, leaving a remainder of 600.
The next digit of our result is 0. 
Result so far: 87227.506
Subtract 0 from 600 to get 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6000, and continue the process.

Step 13:
The number 990 fits into 6000 6 times, leaving a remainder of 60.
The number 6 becomes the next digit in our result. 
Result so far: 87227.50606
The remainder is 60 after subtracting 5940 from 6000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Let's proceed to step 14:
The number 990 fits into 600 0 times, leaving a remainder of 600.
Use 0 as the next digit of our solution. 
Result so far: 87227.50606
Subtract 0 from 600 to get 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6000, and continue the process.

Advancing to step 15:
6000 divided by 990 is 6 with a remainder of 60.
Record the quotient 6 as the next digit in the result. 
Result so far: 87227.5060606
Subtracting 5940 from 6000 leaves us with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Moving on to step 16:
When dividing 600 by 990, we get 0 with a remainder of 600.
The number 0 becomes the next digit in our result. 
Result so far: 87227.5060606
Deduct 0 from 600 and we're left with 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6000, and continue the process.

In conclusion, the division gives 87227.5060606 with a balance of 6e-07.