96660403 ÷ 509 
We want to divide 96660403 by 509.

Step 1:
509 can be fit into 9 0 times, resulting in a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Append the next digit (6) from the dividend to 9 and continue with: 96 / 509

Let's proceed to step 2:
When dividing 96 by 509, we get 0 with a remainder of 96.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 96 leaves us with 96.
Append the next digit (6) from the dividend to 96 and continue with: 966 / 509

Going ahead to step 3:
509 can be fit into 966 1 times, resulting in a remainder of 457.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 509 from 966 to get 457.
Bring next digit (6) of the dividend behind the 457 and repeat the process: 4576 / 509

Moving on to step 4:
509 can be fit into 4576 8 times, resulting in a remainder of 504.
Record the quotient 8 as the next digit in the result. 
Result so far: 18.0
Subtracting 4072 from 4576 leaves us with 504.
Bring next digit (0) of the dividend behind the 504 and repeat the process: 5040 / 509

Step 5:
509 can be fit into 5040 9 times, resulting in a remainder of 459.
The number 9 becomes the next digit in our result. 
Result so far: 189.0
Subtract 4581 from 5040 to get 459.
Include the next digit (4) from the dividend after 459, then repeat: 4594 / 509

Step 6:
509 goes into 4594 9 times with a remainder of 13.
Put 9 as the next digit of the answer. 
Result so far: 1899.0
If we subtract 4581 from 4594, we get 13.
Take the next digit (0) from the dividend and append it to 13, then repeat: 130 / 509

Advancing to step 7:
509 can be fit into 130 0 times, resulting in a remainder of 130.
Write down 0 as next digit of the result. 
Result so far: 18990.0
Subtracting 0 from 130 leaves us with 130.
Grab the next digit (3) from the dividend, add it to 130, then carry on: 1303 / 509

Advancing to step 8:
When dividing 1303 by 509, we get 2 with a remainder of 285.
The number 2 becomes the next digit in our result. 
Result so far: 189902.0
The remainder is 285 after subtracting 1018 from 1303.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2850, and continue the process.

On to step 9:
2850 divided by 509 is 5 with a remainder of 305.
Put 5 as the next digit of the answer. 
Result so far: 189902.5
If we subtract 2545 from 2850, we get 305.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3050, and continue the process.

Step 10:
509 can be fit into 3050 5 times, resulting in a remainder of 505.
The number 5 becomes the next digit in our result. 
Result so far: 189902.55
Subtracting 2545 from 3050 leaves us with 505.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5050, and continue the process.

After the division, we end up with 189902.55 and a remainder of 0.505.