53964066 ÷ 503 
Let's see how many times 503 fits into 53964066.

Advancing to step 1:
5 divided by 503 is 0 with a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Take the next digit (3) from the dividend and append it to 5, then repeat: 53 / 503

Let's proceed to step 2:
53 divided by 503 is 0 with a remainder of 53.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 53 after subtracting 0 from 53.
Grab the next digit (9) from the dividend, add it to 53, then carry on: 539 / 503

On to step 3:
503 goes into 539 1 times with a remainder of 36.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we take 503 away from 539, we end up with 36.
Fetch the next digit (6) from the dividend, attach it to 36 and continue: 366 / 503

Going ahead to step 4:
503 goes into 366 0 times with a remainder of 366.
Use 0 as the next digit of our solution. 
Result so far: 10.0
If we subtract 0 from 366, we get 366.
Bring next digit (4) of the dividend behind the 366 and repeat the process: 3664 / 503

Advancing to step 5:
503 can be fit into 3664 7 times, resulting in a remainder of 143.
Put 7 as the next digit of the answer. 
Result so far: 107.0
Subtract 3521 from 3664 to get 143.
Bring next digit (0) of the dividend behind the 143 and repeat the process: 1430 / 503

Advancing to step 6:
The number 503 fits into 1430 2 times, leaving a remainder of 424.
Write down 2 as next digit of the result. 
Result so far: 1072.0
Subtracting 1006 from 1430 leaves us with 424.
Take the next digit (6) from the dividend and append it to 424, then repeat: 4246 / 503

Advancing to step 7:
503 goes into 4246 8 times with a remainder of 222.
The number 8 becomes the next digit in our result. 
Result so far: 10728.0
Subtract 4024 from 4246 to get 222.
Grab the next digit (6) from the dividend, add it to 222, then carry on: 2226 / 503

Let's proceed to step 8:
If we divide 2226 by 503, we get 4 and a remainder of 214.
The number 4 becomes the next digit in our result. 
Result so far: 107284.0
The remainder is 214 after subtracting 2012 from 2226.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2140, and continue the process.

Let's proceed to step 9:
503 can be fit into 2140 4 times, resulting in a remainder of 128.
Record the quotient 4 as the next digit in the result. 
Result so far: 107284.4
Subtracting 2012 from 2140 leaves us with 128.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1280, and continue the process.

Advancing to step 10:
If we divide 1280 by 503, we get 2 and a remainder of 274.
The number 2 becomes the next digit in our result. 
Result so far: 107284.42
Subtract 1006 from 1280 to get 274.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2740, and continue the process.

Advancing to step 11:
503 goes into 2740 5 times with a remainder of 225.
The next digit of our result is 5. 
Result so far: 107284.425
If we take 2515 away from 2740, we end up with 225.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2250, and continue the process.

Step 12:
2250 divided by 503 is 4 with a remainder of 238.
The number 4 becomes the next digit in our result. 
Result so far: 107284.4254
If we take 2012 away from 2250, we end up with 238.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2380, and continue the process.

Step 13:
If we divide 2380 by 503, we get 4 and a remainder of 368.
Use 4 as the next digit of our solution. 
Result so far: 107284.42544
Deduct 2012 from 2380 and we're left with 368.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3680, and continue the process.

The final result is 107284.42544 with a remainder of 0.000368.