73999951 ÷ 503 
Our goal is to divide 73999951 by 503.

Advancing to step 1:
503 can be fit into 7 0 times, resulting in a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Include the next digit (3) from the dividend after 7, then repeat: 73 / 503

Moving on to step 2:
If we divide 73 by 503, we get 0 and a remainder of 73.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 73, we end up with 73.
Grab the next digit (9) from the dividend, add it to 73, then carry on: 739 / 503

Going ahead to step 3:
503 can be fit into 739 1 times, resulting in a remainder of 236.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we take 503 away from 739, we end up with 236.
Take the next digit (9) from the dividend and append it to 236, then repeat: 2369 / 503

Advancing to step 4:
503 can be fit into 2369 4 times, resulting in a remainder of 357.
Put 4 as the next digit of the answer. 
Result so far: 14.0
If we subtract 2012 from 2369, we get 357.
Grab the next digit (9) from the dividend, add it to 357, then carry on: 3579 / 503

Advancing to step 5:
503 goes into 3579 7 times with a remainder of 58.
Record the quotient 7 as the next digit in the result. 
Result so far: 147.0
Deduct 3521 from 3579 and we're left with 58.
Take the next digit (9) from the dividend and append it to 58, then repeat: 589 / 503

On to step 6:
503 goes into 589 1 times with a remainder of 86.
The number 1 becomes the next digit in our result. 
Result so far: 1471.0
If we take 503 away from 589, we end up with 86.
Append the next digit (5) from the dividend to 86 and continue with: 865 / 503

Moving on to step 7:
865 divided by 503 is 1 with a remainder of 362.
Record the quotient 1 as the next digit in the result. 
Result so far: 14711.0
Subtract 503 from 865 to get 362.
Take the next digit (1) from the dividend and append it to 362, then repeat: 3621 / 503

Going ahead to step 8:
503 goes into 3621 7 times with a remainder of 100.
Record the quotient 7 as the next digit in the result. 
Result so far: 147117.0
Deduct 3521 from 3621 and we're left with 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Moving on to step 9:
1000 divided by 503 is 1 with a remainder of 497.
Use 1 as the next digit of our solution. 
Result so far: 147117.1
If we take 503 away from 1000, we end up with 497.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4970, and continue the process.

On to step 10:
When dividing 4970 by 503, we get 9 with a remainder of 443.
Use 9 as the next digit of our solution. 
Result so far: 147117.19
If we subtract 4527 from 4970, we get 443.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4430, and continue the process.

Step 11:
4430 divided by 503 is 8 with a remainder of 406.
Write down 8 as next digit of the result. 
Result so far: 147117.198
If we subtract 4024 from 4430, we get 406.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4060, and continue the process.

Going ahead to step 12:
When dividing 4060 by 503, we get 8 with a remainder of 36.
The number 8 becomes the next digit in our result. 
Result so far: 147117.1988
The remainder is 36 after subtracting 4024 from 4060.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

The final result is 147117.1988 with a remainder of 0.00036.