We divide 90720351 by 503
We're looking to find how many times 503 goes into 90720351.

Let's proceed to step 1:
9 divided by 503 is 0 with a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Take the next digit (0) from the dividend and append it to 9, then repeat: 90 / 503

Step 2:
When dividing 90 by 503, we get 0 with a remainder of 90.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 90, we get 90.
Grab the next digit (7) from the dividend, add it to 90, then carry on: 907 / 503

On to step 3:
When dividing 907 by 503, we get 1 with a remainder of 404.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 503 away from 907, we end up with 404.
Append the next digit (2) from the dividend to 404 and continue with: 4042 / 503

On to step 4:
The number 503 fits into 4042 8 times, leaving a remainder of 18.
The next digit of our result is 8. 
Result so far: 18.0
If we take 4024 away from 4042, we end up with 18.
Take the next digit (0) from the dividend and append it to 18, then repeat: 180 / 503

Let's proceed to step 5:
503 can be fit into 180 0 times, resulting in a remainder of 180.
Put 0 as the next digit of the answer. 
Result so far: 180.0
If we take 0 away from 180, we end up with 180.
Include the next digit (3) from the dividend after 180, then repeat: 1803 / 503

Going ahead to step 6:
503 can be fit into 1803 3 times, resulting in a remainder of 294.
Write down 3 as next digit of the result. 
Result so far: 1803.0
The remainder is 294 after subtracting 1509 from 1803.
Fetch the next digit (5) from the dividend, attach it to 294 and continue: 2945 / 503

Going ahead to step 7:
503 can be fit into 2945 5 times, resulting in a remainder of 430.
Write down 5 as next digit of the result. 
Result so far: 18035.0
Subtracting 2515 from 2945 leaves us with 430.
Include the next digit (1) from the dividend after 430, then repeat: 4301 / 503

Step 8:
If we divide 4301 by 503, we get 8 and a remainder of 277.
Write down 8 as next digit of the result. 
Result so far: 180358.0
Subtract 4024 from 4301 to get 277.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2770, and continue the process.

Going ahead to step 9:
If we divide 2770 by 503, we get 5 and a remainder of 255.
The next digit of our result is 5. 
Result so far: 180358.5
Subtracting 2515 from 2770 leaves us with 255.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2550, and continue the process.

Moving on to step 10:
503 can be fit into 2550 5 times, resulting in a remainder of 35.
Put 5 as the next digit of the answer. 
Result so far: 180358.55
Subtract 2515 from 2550 to get 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

The quotient of the division is 180358.55, and the remainder is 0.035.