We look at the division of 89486306 by 999 
We want to figure out the number of times 89486306 can be divided by 999.

On to step 1:
When dividing 8 by 999, 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 subtract 0 from 8, we get 8.
Grab the next digit (9) from the dividend, add it to 8, then carry on: 89 / 999

On to step 2:
999 goes into 89 0 times with a remainder of 89.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 89 leaves us with 89.
Grab the next digit (4) from the dividend, add it to 89, then carry on: 894 / 999

Step 3:
894 divided by 999 is 0 with a remainder of 894.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 894 and we're left with 894.
Grab the next digit (8) from the dividend, add it to 894, then carry on: 8948 / 999

Advancing to step 4:
999 goes into 8948 8 times with a remainder of 956.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
If we subtract 7992 from 8948, we get 956.
Include the next digit (6) from the dividend after 956, then repeat: 9566 / 999

Advancing to step 5:
When dividing 9566 by 999, we get 9 with a remainder of 575.
Put 9 as the next digit of the answer. 
Result so far: 89.0
If we take 8991 away from 9566, we end up with 575.
Bring next digit (3) of the dividend behind the 575 and repeat the process: 5753 / 999

Let's proceed to step 6:
999 goes into 5753 5 times with a remainder of 758.
The next digit of our result is 5. 
Result so far: 895.0
The remainder is 758 after subtracting 4995 from 5753.
Append the next digit (0) from the dividend to 758 and continue with: 7580 / 999

Moving on to step 7:
999 can be fit into 7580 7 times, resulting in a remainder of 587.
Use 7 as the next digit of our solution. 
Result so far: 8957.0
Subtract 6993 from 7580 to get 587.
Include the next digit (6) from the dividend after 587, then repeat: 5876 / 999

Advancing to step 8:
When dividing 5876 by 999, we get 5 with a remainder of 881.
Put 5 as the next digit of the answer. 
Result so far: 89575.0
Subtract 4995 from 5876 to get 881.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8810, and continue the process.

Going ahead to step 9:
The number 999 fits into 8810 8 times, leaving a remainder of 818.
The next digit of our result is 8. 
Result so far: 89575.8
If we take 7992 away from 8810, we end up with 818.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8180, and continue the process.

Step 10:
When dividing 8180 by 999, we get 8 with a remainder of 188.
Use 8 as the next digit of our solution. 
Result so far: 89575.88
If we subtract 7992 from 8180, we get 188.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1880, and continue the process.

The quotient of the division is 89575.88, and the remainder is 0.188.