5518878 ÷ 303 
The aim is to understand the frequency of 303 in 5518878.

Moving on to step 1:
303 goes into 5 0 times with a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Grab the next digit (5) from the dividend, add it to 5, then carry on: 55 / 303

Step 2:
If we divide 55 by 303, we get 0 and a remainder of 55.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 55 to get 55.
Take the next digit (1) from the dividend and append it to 55, then repeat: 551 / 303

Step 3:
303 can be fit into 551 1 times, resulting in a remainder of 248.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtract 303 from 551 to get 248.
Fetch the next digit (8) from the dividend, attach it to 248 and continue: 2488 / 303

Advancing to step 4:
303 goes into 2488 8 times with a remainder of 64.
Put 8 as the next digit of the answer. 
Result so far: 18.0
If we take 2424 away from 2488, we end up with 64.
Append the next digit (8) from the dividend to 64 and continue with: 648 / 303

On to step 5:
648 divided by 303 is 2 with a remainder of 42.
Write down 2 as next digit of the result. 
Result so far: 182.0
Subtracting 606 from 648 leaves us with 42.
Grab the next digit (7) from the dividend, add it to 42, then carry on: 427 / 303

Step 6:
The number 303 fits into 427 1 times, leaving a remainder of 124.
The next digit of our result is 1. 
Result so far: 1821.0
Subtracting 303 from 427 leaves us with 124.
Take the next digit (8) from the dividend and append it to 124, then repeat: 1248 / 303

On to step 7:
If we divide 1248 by 303, we get 4 and a remainder of 36.
The number 4 becomes the next digit in our result. 
Result so far: 18214.0
If we subtract 1212 from 1248, we get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Let's proceed to step 8:
When dividing 360 by 303, we get 1 with a remainder of 57.
Write down 1 as next digit of the result. 
Result so far: 18214.1
Deduct 303 from 360 and we're left with 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Step 9:
570 divided by 303 is 1 with a remainder of 267.
The next digit of our result is 1. 
Result so far: 18214.11
Subtract 303 from 570 to get 267.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2670, and continue the process.

The final result is 18214.11 with a remainder of 0.267.