We look at the division of 53991432 by 255 
The aim is to understand the frequency of 255 in 53991432.

Let's proceed to step 1:
255 can be fit into 5 0 times, resulting in a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Fetch the next digit (3) from the dividend, attach it to 5 and continue: 53 / 255

Going ahead to step 2:
If we divide 53 by 255, we get 0 and a remainder of 53.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 53 after subtracting 0 from 53.
Fetch the next digit (9) from the dividend, attach it to 53 and continue: 539 / 255

Going ahead to step 3:
If we divide 539 by 255, we get 2 and a remainder of 29.
The next digit of our result is 2. 
Result so far: 2.0
The remainder is 29 after subtracting 510 from 539.
Append the next digit (9) from the dividend to 29 and continue with: 299 / 255

Moving on to step 4:
The number 255 fits into 299 1 times, leaving a remainder of 44.
Write down 1 as next digit of the result. 
Result so far: 21.0
The remainder is 44 after subtracting 255 from 299.
Bring next digit (1) of the dividend behind the 44 and repeat the process: 441 / 255

Advancing to step 5:
When dividing 441 by 255, we get 1 with a remainder of 186.
Write down 1 as next digit of the result. 
Result so far: 211.0
The remainder is 186 after subtracting 255 from 441.
Bring next digit (4) of the dividend behind the 186 and repeat the process: 1864 / 255

Advancing to step 6:
When dividing 1864 by 255, we get 7 with a remainder of 79.
Record the quotient 7 as the next digit in the result. 
Result so far: 2117.0
Deduct 1785 from 1864 and we're left with 79.
Grab the next digit (3) from the dividend, add it to 79, then carry on: 793 / 255

Let's proceed to step 7:
The number 255 fits into 793 3 times, leaving a remainder of 28.
Use 3 as the next digit of our solution. 
Result so far: 21173.0
If we take 765 away from 793, we end up with 28.
Grab the next digit (2) from the dividend, add it to 28, then carry on: 282 / 255

Moving on to step 8:
282 divided by 255 is 1 with a remainder of 27.
Record the quotient 1 as the next digit in the result. 
Result so far: 211731.0
If we subtract 255 from 282, we get 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Let's proceed to step 9:
If we divide 270 by 255, we get 1 and a remainder of 15.
The next digit of our result is 1. 
Result so far: 211731.1
If we subtract 255 from 270, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

On to step 10:
150 divided by 255 is 0 with a remainder of 150.
Use 0 as the next digit of our solution. 
Result so far: 211731.1
Subtracting 0 from 150 leaves us with 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

Step 11:
255 can be fit into 1500 5 times, resulting in a remainder of 225.
The number 5 becomes the next digit in our result. 
Result so far: 211731.105
Deduct 1275 from 1500 and we're left 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.

Moving on to step 12:
2250 divided by 255 is 8 with a remainder of 210.
The number 8 becomes the next digit in our result. 
Result so far: 211731.1058
Deduct 2040 from 2250 and we're left with 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2100, and continue the process.

Step 13:
2100 divided by 255 is 8 with a remainder of 60.
Put 8 as the next digit of the answer. 
Result so far: 211731.10588
The remainder is 60 after subtracting 2040 from 2100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

After the division, we end up with 211731.10588 and a remainder of 6e-05.