We look at the division of 87750945 by 243 
The aim is to understand the frequency of 243 in 87750945.

Step 1:
243 goes into 8 0 times with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Take the next digit (7) from the dividend and append it to 8, then repeat: 87 / 243

Step 2:
If we divide 87 by 243, we get 0 and a remainder of 87.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 87, we get 87.
Fetch the next digit (7) from the dividend, attach it to 87 and continue: 877 / 243

Advancing to step 3:
The number 243 fits into 877 3 times, leaving a remainder of 148.
The next digit of our result is 3. 
Result so far: 3.0
Subtracting 729 from 877 leaves us with 148.
Bring next digit (5) of the dividend behind the 148 and repeat the process: 1485 / 243

Advancing to step 4:
1485 divided by 243 is 6 with a remainder of 27.
The number 6 becomes the next digit in our result. 
Result so far: 36.0
Deduct 1458 from 1485 and we're left with 27.
Include the next digit (0) from the dividend after 27, then repeat: 270 / 243

Step 5:
243 goes into 270 1 times with a remainder of 27.
Put 1 as the next digit of the answer. 
Result so far: 361.0
If we subtract 243 from 270, we get 27.
Include the next digit (9) from the dividend after 27, then repeat: 279 / 243

Moving on to step 6:
279 divided by 243 is 1 with a remainder of 36.
The next digit of our result is 1. 
Result so far: 3611.0
If we subtract 243 from 279, we get 36.
Bring next digit (4) of the dividend behind the 36 and repeat the process: 364 / 243

Step 7:
When dividing 364 by 243, we get 1 with a remainder of 121.
Write down 1 as next digit of the result. 
Result so far: 36111.0
Subtract 243 from 364 to get 121.
Append the next digit (5) from the dividend to 121 and continue with: 1215 / 243

Advancing to step 8:
243 can be fit into 1215 5 times, resulting in a remainder of 0.
The next digit of our result is 5. 
Result so far: 361115.0
Subtract 1215 from 1215 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 9:
If we divide 0 by 243, we get 0 and a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 361115.0
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 10:
When dividing 0 by 243, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 361115.0
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 361115.0 with a remainder of 0.0.