We're dividing 51205651 by 503 
We want to figure out the number of times 51205651 can be divided by 503.

Advancing to step 1:
When dividing 5 by 503, we get 0 with a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Append the next digit (1) from the dividend to 5 and continue with: 51 / 503

Advancing to step 2:
503 goes into 51 0 times with a remainder of 51.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 51 leaves us with 51.
Include the next digit (2) from the dividend after 51, then repeat: 512 / 503

On to step 3:
503 goes into 512 1 times with a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 503 from 512 leaves us with 9.
Grab the next digit (0) from the dividend, add it to 9, then carry on: 90 / 503

On to step 4:
503 goes into 90 0 times with a remainder of 90.
The next digit of our result is 0. 
Result so far: 10.0
If we take 0 away from 90, we end up with 90.
Bring next digit (5) of the dividend behind the 90 and repeat the process: 905 / 503

Let's proceed to step 5:
When dividing 905 by 503, we get 1 with a remainder of 402.
The next digit of our result is 1. 
Result so far: 101.0
Subtracting 503 from 905 leaves us with 402.
Bring next digit (6) of the dividend behind the 402 and repeat the process: 4026 / 503

Going ahead to step 6:
The number 503 fits into 4026 8 times, leaving a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 1018.0
If we subtract 4024 from 4026, we get 2.
Include the next digit (5) from the dividend after 2, then repeat: 25 / 503

Advancing to step 7:
503 goes into 25 0 times with a remainder of 25.
Use 0 as the next digit of our solution. 
Result so far: 10180.0
Subtract 0 from 25 to get 25.
Grab the next digit (1) from the dividend, add it to 25, then carry on: 251 / 503

Going ahead to step 8:
251 divided by 503 is 0 with a remainder of 251.
Put 0 as the next digit of the answer. 
Result so far: 101800.0
The remainder is 251 after subtracting 0 from 251.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2510, and continue the process.

Let's proceed to step 9:
2510 divided by 503 is 4 with a remainder of 498.
The number 4 becomes the next digit in our result. 
Result so far: 101800.4
Subtract 2012 from 2510 to get 498.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4980, and continue the process.

Advancing to step 10:
503 can be fit into 4980 9 times, resulting in a remainder of 453.
Use 9 as the next digit of our solution. 
Result so far: 101800.49
If we subtract 4527 from 4980, we get 453.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4530, and continue the process.

Step 11:
The number 503 fits into 4530 9 times, leaving a remainder of 3.
The next digit of our result is 9. 
Result so far: 101800.499
If we subtract 4527 from 4530, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

The final result is 101800.499 with a remainder of 0.0003.